The h Bar - 2016-12-03 (page 3 of 4)

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3:00 PM

I see, (barring that I forgot to show the closure under addition), my mistake is I let some $i \in I_x,\forall x$ and then deduce $i \in I$ by intersection, rather than the correct logic flow above that let arbitrary $i \in I$ and then deduce $i \in I_x, \forall x$

thanks

user116211

$\mathsf{Pr}\infty\mathsf{fWiki}$ generally follows some books and more or less write the same things with explicit mentioning of the respective axioms and of course proper notations.

I'm sitting down to eat my lunch, to I'll be too busy to type for the next few minutes :-)

@ACuriousMind, I read through the linked articles. =)

bleh, I don't know why when I tried to proof things, I often end up having the logic backwards and "proving" the converse instead...

I wonder if with more experience, I can reverse my logic flow back into the normal, correct one

user116211

@JohnRennie You can type in one hand and ... ;)

3:02 PM

@JohnRennie You definitely need to learn to type with your feet

user116211

;D

Attempting to proof the quasi simple ring statement shared by MAFIA earlier, but then realise I am too lazy to read about the definition of dense in dense rings

Currently, I got brain BSOD whenever I read limit related things

I still yet to be able to efficiently process concepts of analysis

$\beta(n) = n+1$ - given
$\beta : \mathbb{Z}\to\mathbb{Z}$ - given
iff $\beta(x_1)=\beta(x_2)$ implies $x_1 = x_2$ then $\beta$ is one to one - def of one to one
if $x_1+1=x_2+1$ implies $x_1=x_2$ then $\beta$ is one to one
$x_1+1=x_2+1$ implies $x_1=x_2$ by the subtraction property of equality
therefore $\beta$ is one to one

^does this proof make any sense?

@heather Yes

yay! how formal/well-written is it?

3:15 PM

Although no-one I know uses "one-to-one", we call that "injective".

oh. good to know

@heather It's overly formal for my taste.

oh. how would you say it should be written?

Like, "by the substraction property of equality" is something I'd just consider understood. If the reader can't figure out why $x-1 = y-1$ implies $x=y$ then they have no business reading my proof to begin with :P

=)

okay, that makes sense

geometry is teaching me wrong =P

but then, I guess in geometry we're proving really simple stuff, so we need to use the simpler properties.

3:20 PM

In australia, year 1 start with introducing injective and surjective as "one to one" and "onto" to build our intuition. In higher years, they use the more formal terms

my book (durbin) mentioned injective/surjective but uses one to one and onto.

Well, it's not wrong, and everyone will understand you, I just don't know anyone how says one-to-one

Probably because eins-zu-eins sounds silly in German :P

lol

=)

user116211

Almost all books at the introduction of this concept, at least uses one-to-one along with injective.

user116211

3:32 PM

However, Herstein, peculiar for its notations, always uses one-to-one term; I hardly saw him using injection, not even in the definition.

yeah I've got an introductory type book I think

user116211

3:43 PM

Lately, I discovered that I can compress the MathJax if I press on them with the cursor and then a blue double arrow marks appear and I can expand them on pressing the arrow; cool.

user116211

Hmm, direct sum; well.

@MAFIA36790 what?

I don't understand what you are trying to say with "compress"

I also don't see any double blue arrows

Look upon my works ye mighty and despair:

user image

That is a pulled pork pizza sandwich.

Pulled pork with cheese and jerk BBQ sauce made into a sandwich between two deep pan pizza bases.

What on earth is jerk sauce?

Doesn't sound too friendly

Jamaican jerk spice

Jerk is a style of cooking native to Jamaica in which meat is dry-rubbed or wet marinated with a very hot spice mixture called Jamaican jerk spice. Jerk seasoning is traditionally applied to pork and chicken. Modern recipes also apply jerk spice mixes to fish, shrimp, shellfish, beef, sausage, lamb, vegetables, and tofu. Jerk seasoning principally relies upon two items: allspice (called "pimento" in Jamaica) and Scotch bonnet peppers. Other ingredients may include cloves, cinnamon, scallions, nutmeg, thyme, garlic, brown sugar, ginger, and salt. == Etymology == The term jerk is said to come from...

3:59 PM

::trembles in awe:: I think I'd have a heart attack after eating that =)

looks delicious

user116211

@ACuriousMind Wait, I might have some snapshots.

user116211

user image

user116211

user image

@MAFIA36790 Do you mean, when you select the "collapsible math" option?

user116211

@Loong maybe. I don't know the name.

user116211

4:12 PM

@Loong Wait, I hadn't selected any option; I mistakenly tapped on the equation; generally it enlarges (on double-tapping), an option pop-ups to show the MathJax code; but the blue-double arrow symbol appeared from nowhere then.

@MAFIA36790 check: right click on a formula -> Accessibility -> Collapsible Math

user116211

@Loong yes, noticed the option.

and the enlargement of the forumla on double-click is set here: right click on a formula -> Math Settings -> Zoom Trigger

user116211

Thanks @loong.

@MAFIA36790 btw, you can also set the font preference for MathJax, but this option is usually disabled in the pop-up menu. However, you can enable it when you type MathJax.Menu.showFontMenu(true) into your browser console.

user116211

4:26 PM

Ahh! That's new.

<a href="http://area51.stackexchange.com/proposals/94442/quantum-computers?referrer‌=NZE4p5xG0GzRWwMO9Qc4pg2"><img src="http://area51.stackexchange.com/ads/proposal/94442.png" width="300" height="250" alt="Stack Exchange Q&A site proposal: Quantum Computers" /></a>

hmm, it doesn't show up correctly

no html in chat, I believe

well, then: Quantum Computers - Area 51 Proposal - please support

99

Quantum Computers

Proposed Q&A site for people interested in the applications, programming, design and functionality of Quantum Computers.

Currently in definition.

Which kind of questions about quantum computers can you not already ask either here or on one fo the cs sites?

to quote the comments: "Quantum Computing is a rapidly growing field which encompasses a lot of questions about physics, computer science, mathematics, and engineering. I think it would be interesting to have a site here that gives access to that information directly."

that's like saying that just because you can ask a question about ubuntu on stack overflow or linux, we shouldn't have that site. But really there are enough people interested in it that I think it would be a great site to have.

4:33 PM

@heather You could include your referrer id to get more unicorn points: area51.stackexchange.com/proposals/94442/…

@Loong, your referrer id?

@heather the last part of the link: http://area51.stackexchange.com/proposals/94442/quantum-computers?referrer=NZE4‌p5xG0GzRWwMO9Qc4pg2

@heather There are good arguments for the ubuntu/linux split, see e.g. stackoverflow.blog/2010/08/unix-and-ubuntu-why-both "Ubuntu users" form a subcommunity with goals different from the Unix community at large, and there are enough of them to easily sustain a site

Also, you have to note that Unix and Ubuntu SE were launched simultaneously, not in succession

NZE4p5xG0GzRWwMO9Qc4pg2 is my referrer id, then?

In this case, we already have the SEs - physics, math, cs, tcs - where every quantum computing question I can think of would be on-topic

So the new proposal would simply be one more site the users on these sites would have to be active on

Conversely, I cannot conceive of a user who would participate in quantumcomputing.SE but not in at least one of the other ones.

4:37 PM

@ACuriousMind, let me rephrase: yes, there are several sites where these sorts of questions would be on-topic. But, why split up that user base? It seems to make more sense to make a quantum-computing focused site.

@heather Sense for what?

To achieve what goal?

for people who are interested in quantum computing to get good information about it/answers to questions about it

Well, but those people already can go to physics/cs/tcs for that

We have a quantum computing tag and it is used for that

I don't see any need to fracture existing userbases.

the userbase is fractured because it is split between those sites; this would put it back together so to speak

@heather Yes, the result looks like this: i.stack.imgur.com/MMMkp.png

4:40 PM

Let me also note that there's no convincing argument how this site is supposed to be different from physics and cs at the proposal itself - the only answer to the discussion is from peterh and makes his usual false assertions about how physics.SE and other sites work.

@Loong, okay, thank you.

@heather And why is that necessary? What does this site offer that they cannot get at the existing sites?

@ACuriousMind, if you have people interested in quantum computing, why are we making them go to three different sites depending on the question for an answer?

it offers a more focused site that would answer all quantum computing questions, not just a subset of them.

...because quantum computing is an interdisciplinary field and those sites already exist?

Typically, I expect a new SE site to cover a topic and a community that was not covered by the SE network before

that's like saying, bioinformatics (another proposal) shouldn't be a site because the questions can be answered on some combination of biology.se and the various programming sites

4:43 PM

@heather Yes, I don't see the use of that, either.

@ACuriousMind it does though - there are parts of quantum computing that aren't answered at physics/cs/tcs - like the engineering aspects of quantum computing.

There are already so many SE sites that I can barely keep them all in mind. Proliferating them without good reason is not something I want to see, because it will lead to questions being duplicated across sites and effort wasted answering the same question on different sites.

@ACuriousMind Apologies, but that seems a narrow-minded view of the case. Bioinformatics is a legitimate field with enough participants to warrant a new site, at least in my opinion.

the same is the case for quantum computing.

@heather I'm not saying it's not a legitimate field! I'm saying we don't need sites dedicated to interdisciplinary fields if we already have sites for all disciplines involved unless it is demonstrated that a significant number of questions from the field would be off-topic on all existing sites.

@ACuriousMind And I think a significant number of questions about quantum computing would be off-topic at existing sites; i.e., engineering/construction type questions.

4:47 PM

@heather Such as?

I'm looking at the example questions for the site, I don't see any such questions there

I see a few which would be off-topic as opinion-based or something like that, but none that would be off-topic as engineering.

oh, HNQ, why do we love you so much?

user image

buggiest piece of software on SE, I think

apparently this is "by design".

@EmilioPisanty lol

@ACuriousMind okay, what a question was added along the lines of "How is [x] constructed?" - that is off-topic at cs/tcs and probably off-topic here.

@heather It's not clear from the way the proposal is written that such questions would be on-topic there.

And there are no upvoted example questions that would indicate that

okay, then I'll add one like that and see what happens, but the purpose is that they would be on-topic there - it is supposed to cover every aspect of quantum computing.

4:55 PM

@heather Well, in your mind. I don't see much evidence that the other followers thought much about the issue of the overlap in topic with existing sites.

true, and I agree peterh's answer doesn't really answer the question. Maybe i'll write an answer.

I'm also worried that you are the only follower active on physics/cs/tcs that I can see in the recent follower list

@ACuriousMind, why, do you think no one that is an expert is following it?

@heather Yes, I suspect the large majority of followers just think quantum computing sounds cool.

Alas, I am a cynic and may well be wrong about that :P

=P Many of the followers seem to be active on sites such as stack overflow, code review, mathematics, etc

4:58 PM

@Skyler Lucky Dragon. It's a little more expensive than most other Chinese places around here but also a lot better.

@DanielSank, quantum computing proposal =D

on area 51

@heather Sure, they're techy people, but as I said the main overlap here (apart from the engineering questions) would be with physics/tcs/cs. I don't see any other people from these sites.

Yes I've been trying to understand what y'all are talking about.

Which also means that your "this site is to bring the scattered quantum computing users on physics/cs/tcs together" is not what is happening.

TCS?

5:00 PM

theoretical computer science

theoretical computer science

essentially the MO version of cs, I think

@ACuriousMind, couple seconds ahead of you =P

And yeah, its the "higher level" version of cs.

from what I've experienced, though, there actually isn't that dramatic of a difference in the questions like there is between math/math overflow

@DanielSank, we're talking about a Quantum Computing site proposal on Area 51:

area51.stackexchange.com/proposals/94442/…

@heather Frankly, that proposal is terrible in its current state.

@EmilioPisanty "in its current state" - what would you say needs to be fixed?

Every question is a pop-science question from a layman to an expert

there are no questions from experts

5:07 PM

yeah. that's very true.

or indeed any questions that would provide any sort of real challenge to an expert

there aren't even really any "middle-ground" questions.

that then means that there is very little real incentive for experts to drop in and answer

where "very little" is a euphemism for "none"

you need to focus on bringing in experts, and the laymen will come

okay. I'm not sure I myself know enough to really ask expert-level or even middle-level questions.

but, frankly, I don't see how such a site would help bring in experts. They already have venues to ask their questions and plenty of interesting questions to pick up and answer, both here and in TCS.

you don't just need to answer "what value does this site add beyond the status quo?" in the abstract

(though I can't see anything in that direction either)

you need to answer what value the site adds to experts specifically.

5:11 PM

well. at this point, none really.

::sighs::

... so... the status quo is actually pretty good, and there's little need to mess with it?

well, i mean, I'd like a site like I imagined the quantum computing site would become. but i don't know if the way the proposal is currently formulated it is possible to turn it around.

user116211

0

Q: Is my summary correct?

I made this summary of all kinds of subjects and I am wondering if my summary is true. My summary is quite simplisctic it doesn't use any math but it rather explains things using reasoning. Don't feel obligated to correct everything. It would be way easier to tell me what I got right as I have a...

quantum-mechanics general-relativity ferromagnetism

user116211

Too mammoth?

Hey, hey, how was the film?

user228700

5:19 PM

@Mew@JohnRennie: The movie. So. F*ing. Good.

So I should definitely read the novelisation then :-)

user116211

It has cause of cancer too.

user228700

I cannot tell remember the last time I had such a spectacular "AAAAAAAAHHHH" moment during and after a movie.

@MAFIA36790 dear lord

user228700

I'm at loss for words.

5:22 PM

btw @ACuriousMind

user image

user228700

(It definitely sounds like I'm completely overselling it but I cannot help it)

stolen from the tex.se chat

@EmilioPisanty I am horrified

user228700

@JohnRennie Yes. I am going to watch the movie many more times and I will definitely pre-order the book.

user116211

@EmilioPisanty ;D

5:23 PM

Although I now wonder when I last saw a paper clip

@EmilioPisanty I think the HNQ is just great. In fact I think it's really great :-)

user116211

@ACuriousMind Someone upvoted it too.

user228700

I am going to go do some more fangirling before bed. Night :-)

user116211

HNQ is a faulty beast; that's it.

@JohnRennie I think there's not enough data to tell whether it's great or terrible

34

Q: Please open the Hot Network Questions to auditing via the Data Explorer

One of the contentious issues on today's Stack Exchange is the Hot Network Questions sidebar, which can drive a lot of traffic to junk-food questions that can be very poor fits to the sites that host them (and, because of that, it can land a ton of rep on askers and answerers that by normal site ...

feature-request data-explorer hot-questions

user116211

5:24 PM

A basic homework of first-order logic is in HNQ.

@Kaumudi Goodnight. See you tomorrow.

@JohnRennie Is the server down yet :P

user116211

5:44 PM

@BernardMeurer Don't tell me you attacked Old John's rats.

@MAFIA36790 With my Kindle, yeah

:P

user116211

That's a cool weapon ;)

@ACuriousMind Your mom has measure zero, looser

@ACuriousMind Also, thanks for the answer :)

@MAFIA36790 Yeah :v. The kindle has an unprotected UART, you can just use that to hax it

@BernardMeurer You realize that's the opposite of calling my mom fat? :P

@ACuriousMind Dammit

5:49 PM

@EmilioPisanty I find the total lack of CM response on that sad

@ACuriousMind yeah, I'm a bit bugged by that

A "this isn't as easy to implement as you think" or "we have good reasons to not do that and they are:.." shouldn't be that hard

particularly since it's got a good response and it had a bounty on it

Bah, it can't be that hard to implement

ffs

<s>had</s> has

@ACM well, you can add an answer saying "this would be really good and shame on CMs for not answering"

5:52 PM

@ACuriousMind Fite

get 100 free rep on meta.se

anyways, any TeXites here that can help me debug a document?

supposedly "the default is that all fonts are embedded:"

2

Q: Font is not embedded

I need to create pdf file with all fonts embedded (from tex source). But, as I understood, the most common fonts are not embedded by default. Therefore I have problems: ? 8 Error Font Times-Bold is not embedded ? 8 Error Font Helvetica is not embedded ? 8 Error Font Symbol is not embedded ? 8 Er...

fonts tex-core embedding

and yet

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"F47" and "F95" are not embedded

6:14 PM

@BernardMeurer I can't believe you haven't broken Burn yet. The young of today just won't work at things! :-)

@JohnRennie Lol, is this a challenge I hear?

Because may I remind you I have an arbitrary precision, mutithreaded Ackermann calculator ready to rock

...why? :P

So if I'm woken during the night by the server cooling fans ramping up to turbo boost I know who to blame :-)

@ACuriousMind It seemed like a nice project :P

@JohnRennie what if there's a restaurant immediately next to my front door?

6:26 PM

@EmilioPisanty that is an inspired bit of house selection! :-)

@JohnRennie not particularly

google.co.uk/maps/@52.4850256,13.4271809,3a,15y,11.16h,86.59t/…

the City Call place is now a pizza place

but seriously

I don't think you can live more than 50m away from a restaurant in this neighbourhood

RE parity and time reversal:

What would be the significance with respect to these symmetries of a non-zero result for a measurement of these quantities in a given nucleus or particle?

As I understand it, a non zero result would indicate a violation of the symmetry, such as the preferential direction of beta decay. What would a violation of time reversal "look like"?

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@JohnRennie A former flatmate of mine now lives directly across the street from the mathematical institute and directly above an Italian restaurant, talk about inspired house selection

@JohnRennie could you explain me the solution

user116211

6:33 PM

@ACuriousMind WTH; he lives in Heaven ;/

someone Explain me what is done in the solution in above question

@koolman I hope you could get it up to the proportionality? I'm trying after that.

@koolman ok, possible hint: Try differentiating the proportionality.

@SwapnilDas yep

@SwapnilDas how can we differentiate proportionality

6:49 PM

Assume k as the proportionality constant and differentiate wrt Temperature.

After that which result I would get @SwapnilDas

When we differentiate V can we write dV/dT

And then on the other side?

I think a quantum computing site could make sense, @heather @ACuriousMind, but it's unclear to me how to think about multidisciplinary sites.

Are there enough people/interest to support a QC site currently?

@SwapnilDas k[1/(1-n)] T^[n/(1-n)]

Am I correct

7:07 PM

@koolman hmm yes. I'll try proceeding.

Ohk

@koolman you've read thermodynamic process isn't it?

Yes

What's n?

Any number

Polyprotic process

7:23 PM

@DanielSank, oh, I had a question about your quantum computing setup

you use an eight bit digital to analog converter to couple your qubits, right?

@heather Just for the sake of your fingers in the future Digital to Analog Converter = DAC; Analog to Digital Converter = ADC :)

@BernardMeurer, thanks =) acronyms are nice

@koolman Reached anywhere?

@SwapnilDas tried , but no result :(

7:39 PM

@heather That is not correct.

The qubits are coupled by having capacitance to each other.

The readout signal is collected by an 8-bit analog-to-digital converter.

@SwapnilDas its too late , I have to go for a sleep . If you got the answer then message it and ping me to it .

Bye , good night

@koolman Night.

@DanielSank, oh, that makes more sense. I got confused there. =) But my question was, with the DAC, would it be convenient to have a higher bit converter? like would having 9 bits, or 10 bits, for example, instead of 8, be useful?

@heather DAC = Digital to Analog Converter

ADC = Analog to Digital Converter

We use a 14 bit DAC to produce our control signals.

We use an 8 bit ADC to collect our readout signal.

oh, hmm, okay

7:42 PM

More bits on the ADC would be convenient, yes.

More bits on the DAC would also be nice.

More bits is always nice.

Why do you ask?

well, i was thinking about a science fair project, and my dad suggested i look into more peripheral projects, like a better way to cool down the quantum computer, for example, and I thought of this.

o_O

did I say something weird?

What project are you suggesting here?

Building a better DAC would be a massive undertaking requiring state of the art fabrication facility and a huge team. In other words, competing with the silicon industry is... difficult.

working on building a DAC or ADC with a higher number of bits than 8 or 14 (perhaps, I really don't know yet; I was just thinking about it).

7:49 PM

@heather Aah. I remember my project days.

What I would highly recommend for you as a project would be to build a low speed DAC with a few bits to learn how it works.

@heather Sure, you can make a DAC with more bits, but don't go into it thinking it will be more useful than commercial parts.

The silicon chip industry is enormous.

I tried to give a sense of this in the very first paragraph of my thesis.

I cite the annual research and development budget of Intel. Care to guess the number?

billions, i'm sure

i'll go for 200 billion

though that is probably outlandishly off =)

It was over 10 billion 2013.

@DanielSank surely the way to put this in context is specifying the largest country whose GDP is smaller than that

oh wow

7:52 PM

@EmilioPisanty Yeah, I should have done that.

In fact, I'll file an issue on my thesis repo on that.

done

... which weirdly turns out to be Madagascar?

136th largest out of 190

so larger than 50 countries' GDP or so

at least going by statisticstimes.com/economy/countries-by-projected-gdp.php

TIL

Anyway, @heather, I would encourage you to build something for your project!

really? I googled it and found Tajikstan, as of 2014

An ADC or DAC woudl be a great project.

statisticstimes.com/economy/countries-by-gdp.php

@DanielSank, okay. I'll read more about it =)

7:55 PM

Another fun one would be to build an AM radio, perhaps using an FPGA!

That would be SO cool and you'd really learn something new there.

You can get FPGA development boards for not too much $$.

I can spout off a lot of ideas depending on how much time you want to invest.

that would be really cool, but i'm not sure that's what i should do for the science fair. my dad said i need to do something new and innovative for it to win. he wants me to enter the intel science fair in highschool and considers this year as practice for that.

Ah, ok.

which, i mean, it'd be cool to win, but i'm not sure i'd be able too

So right there are different ways to think about science fairs. If your goal is to win, then you should do something that stands out as unique.

But keep in mind that the people judging these things are scientists and are reasonably good at seeing through BS.

For my high school project, I simply electrolyzed water into hydrogen and oxygen. I tested different salt solutions.

I took good date, explained the difficulties (i.e. the salt deposits on the electrodes and makes the process slow down).

I did not win, but the Maryland society of engineers gave me a prize for having the most "obviously this person actually did this themselves" project.

wow, that's cool!

8:00 PM

I was happy about that. Across from my setup was someone who used an electron microscope to characterize heat damage of space shuttle heat shield tiles.

That person obviously had a parent/relative/something with access to the equipment, and had a lot of training from someone. That's a very good thing. It's good to seek out a high level of training and do something cool!

All I'm saying though, is that the engineering folks looked at that, and looked at my dumb little setup, and saw something they valued about mine.

All of this is to say:

Do what you want.

Winning a science fair is awesome, but make sure you do something you want to do.

I would advise you to think about your own interests more than about a flashy presentation.

@DanielSank I hope you still have a trophy that says "Winner of the 'obviously this person actually did this themselves' award" somewhere :)

Because that's the most awesome award title I've ever heard

@ACuriousMind I have no idea where it is. It wasn't a trophy though. It was paper.

that's partly what i'm worried about. because my dad is so smart, he'll look over my shoulder, see me struggling and be like "no, do it like this" and then basically walk me through it, even though that completely ruins it for me. like once, i was doing one of the euler problems, and it took me hours to figure out, and my dad looked over my shoulder, and i said to go do it yourself if you want to do it (=P) and he did it in 5 minutes.

That experiment sucked... the KOH fumes kept getting into my contact lenses and it hurt.

@heather Well, your dad has a lot more experience than you do :)

so i worry that i'll get interested in something and it'll become his project and he'll become frustrated with me not getting it. because most of the time, it takes me forever to figure things out.

8:04 PM

Can you explain your goals to him? For example, maybe you like his help but you need him to let you struggle?

@DanielSank yeah, I know =)

@heather Honestly, from the pace with which I have you seen learn things here, your "forever" seems to be the usual timespan people take to figure new stuff out, if not shorter.

Honestly, your dad is a fantastic resource for you. If you two can work out a collaborative relationship that works for both of you, that would be so awesome.

@DanielSank, yeah =) that's why i like working with him, because he knows so much.

@heather is your dad a scientist/engineer?

8:09 PM

@SwapnilDas, electrical engineer, but he's also into plasma physics and did a lot of that when he was younger.

@heather Right, but you two need a balance. As all good teachers know, if you spoon feed everything, the student actually doesn't learn as much. It's very hard to get that balance right, and I imagine it's even harder if the student is your child because you really want that person to succeed in the short term.

Oh, that's cool! You're surely in an advantage as a science enthusiast

@DanielSank, yeah. I'll try to talk to him today about it; we'll see how it goes. =)

One option is to pick a subject he doesn't know, lol.

(That's a joke)

@DanielSank, lol, I'm not sure there is such a thing within the realm of physics =P

(Also a joke)

8:17 PM

HAHA

@ACuriousMind Latest LaTeX gripe:

0

Q: Miktex degrades MnSymbol fonts to type 3 fonts

I'm having some trouble getting Miktex to correctly include some fonts in my document. The document compiles correctly over linux (texlive 2015) but when I run it over windows (miktex 2.9) it turns the MnSymbol fonts into type 3 fonts. This caused the library to reject the file for my PhD thesis ...

fonts miktex embedding mnsymbol

MikTeX decided out of the blue that it's just randomly going to pick fonts and only embed them as bitmaps instead of vector fonts

"too many alphabets" error. Wat.

@ACuriousMind don't get me started on that one

Fonts are the part of TeX I really don't want to deal with

fonts are the part of TeX that TeX is meant to take care of for you

8:27 PM

lol

true, I guess

1

A: Miktex degrades MnSymbol fonts to type 3 fonts

It happens MiKTeX forgets to launch updmap after it installed font files. Thus the type 1 fonts databases (psfonts.map and friends) are not updated. Normally, all you have to do is to run updmap --verbose as administrator.

o.O

TeX is weird

8:55 PM

@heather I have to say one more thing:

People who focus on their interests usually wind up successful.

You are good at this, and we all admire you for it.

3

Winning a science fair is great, but it won't give you a free pass to a successful career in science.

Hard work over a long time, and breathing life into your own interests is what gets you where I think you want to go.

@heather I wouldn't worry about winning the fair, that's perhaps putting too much esteem into whoever evaluates it. Build something that makes you go "HOLY CRAP THIS IS THE COOLEST THING"

^ That

9:22 PM

Does Qmechanic ever chat in the H bar?

He's so mysterious.

@DanielSank Remember when we talked about saying "In this Letter..." in an arXiv upload?

one case in point: arxiv.org/abs/1603.03312

making a fair amount of noise on the popular press

aps.altmetric.com/details/6160224/news

... even though the arXiv version says Letter but the publication is in Phys Rev D

not that PRL editors and referees have the best view of the significance and broad interest of results

but on this one I sort of side with them

@JamalS Yes, see e.g. here. Chat history is public

9:43 PM

@EmilioPisanty interesting

We would have modified our arxiv submission appropriately if we hadn't made it into prl.

@DanielSank hah, fair enough ;-)

Our group always updates the arXiv after the final peer review is done.

I wonder if that's against the rules...

10:01 PM

I don't think so, as long as you don't use the final published PDF provided by the journal. I would assume that's copyright infringement. But simply updating your own LaTeX source to incorporate edits made during the review process is fine, as far as I know...

...but that might be one to ask a lawyer on, to be sure

10:13 PM

@DanielSank, thank you so much for the advice. I will think about what I want to do for the science fair with that in mind.

@DavidZ @DanielSank Updating the arXiv with an author-prepared pdf with post-peer-review fixes is perfectly OK for APS journals, but it is forbidden by other publishers. In the general case, the best advice is to look at SHERPA/RoMEO as a starting point, but really it's all in the publisher policies and whatever transfer of rights you signed.

That's true, I should have mentioned it does depend on the journal. But I thought most copyright transfer agreements (including the APS one) forbid public posting of the final journal-prepared PDF file.

That was why I never put journal versions of any of my papers on arXiv...

...whoops, I guess :-P

10:29 PM

For those who are interested, I created a github repository with a piece of code I've been working on that simulates an ideal quantum computer. It takes in user input, and it currently only works for single qubit operations.

Here is the repository.

You're beginning with Python, right? Code Review would be a good resource to check out, if you haven't already.

I don't mean to imply that there's anything horribly wrong with your code, just saying, in general, a person can get a lot of good advice there. Especially if you're starting out with the language.

at this point a key part of the program doesn't work, so skimming their "what is on/off-topic" meta post i don't think it is quite ready for that yet. i will certainly keep that in mind though!

10:48 PM

@DavidZ no, that's not quite right. APS does allow you to post APS pdfs in your own webpage or in your institution's repository.

@DavidZ, the code only works for single-qubit operations and one type of two-qubit operations. There are several types of two-qubit operation that should be manageable but aren't.

@heather sure

@heather cool

btw @heather

18

Q: Giving malicious crawlers and scripts a hard time

My webserver has been up for < 25 hours and has already been crawled for various default pages, just to name one /administrator/index.php. I understand that this is very common and it's not really an issue for me, as I have secured the server in a decent manner. For the following idea, let's as...

webserver vulnerability-scanners web-service honeypot

on the subject of setting up a web server on your home machine

@EmilioPisanty, okay, thank you

Relevant - try it yourself! security.stackexchange.com/admin.php — James Thorpe yesterday

4

lol

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