Mathematics - 2021-06-23 (page 1 of 2)

I liked Latin, and could manage the declensions & conjugations, but you do not have to speak it. I can manage the pronunciation, but that is not my problem.

Ted Shifrin

12:04 AM

Spanish pronunciation is consistent. English hopeless.

Yorch

there's a ton of americans supervising the car manufacturers in Guanajuato

and they pick it up fast

Koro

I don't know why they pronounce j as h though

copper.hat

I am good at picking up the minimal necessary to survive, but I want to be able to converse with people not just get food & lodgings.

Yorch

I love Lucy english Pronunciation

►

Koro

anyways, that's espanol. One of the languages that I want to learn to

copper.hat

12:05 AM

Few languages are consistent.

Koro

Japanese too @copper

Words are pronounced almost the way they are written

Ted Shifrin

Yorch, my favorite, which I've put here before is GHOTI.

copper.hat

fish, no doubt

Ted Shifrin

Shhh.

Yorch

I think spanish in colombia is pronounced pretty well

also in Madrid

but in other places we do egregious stuff

copper.hat

12:07 AM

I like local stuff.

Yorch

in mexico city it is common to replace a word with any other word that has a sufficiently long common prefix

And leave it to the other person to deduce the word from contex

copper.hat

I was surprised in the Barcelona area that the language had a strong French influence.

Yorch

My grandpa has lived in Barcelona for over 60 years but likes to pretend he doesn't speak catalan

copper.hat

Should not be a surprise, I suppose, language is somewhat continuous with respect to location.

Why not speak Catalan?

Yorch

I don't know he likes to troll people

I don't think there's a very serious reason

He also likes to order roasted lambs whenever they take his order

copper.hat

12:10 AM

I was looking for tortillas there, I did not realise one had to describe them as Mexican tortillas

Yorch

oh yeah

they'll give you the omelette thing

copper.hat

We had 13 family members staying in the hills

Yorch

do they have mexican tortillas?

copper.hat

the kids liked quesadillas

they did, once we got over the omelette thing :-)

Yorch

Yeah when we go there my parent's friends ask my dad to cook stuff

he never gets asked to cook stuff in mexico

they ask him to do the thing with cheese and peppers and tortillas

copper.hat

12:12 AM

I have a weakness for MX food.

Yorch

Me too, I need to cook more unhealthy food in my house

copper.hat

It is a serious health risk for me

Yorch

we've always cooked completely healthy food in house

but since the pandemic that means my dose of unhealthy food has gone down way too much

I think unhealthy food is good in low doses, since it makes me happy and indirectly more healthy

copper.hat

there are only a few MX places near Albany, CA.

there used to be lots of places on International Boulevard in Oakland & surroundings

I only have one MX friend in Albany.

Yorch

dang, why'd they close, did the mexican fad wear out?

or was it covid related?

copper.hat

12:17 AM

I think a lot of places on International closed down, long before the covid thing

Yorch

I think peruvian food is currently the more fashionable latin american food

copper.hat

Not just MX

Yorch

although personally I like Sinaloan ceviche more than Peruvian

copper.hat

My fave place used to by the Mission in SF

There is a Sinaloan place in Berkeley, but it is more fast food for students

I think MX food caters to stereotypes here

I love ceviche and similar.

Yorch

I feel like everything caters to stereotypes now :/

copper.hat

12:19 AM

Poisson cru, etc

Unfortunately I think you are right

Travel is not the adventure it used to be

My wife & myself went to Cancun before the Hotel Zone infection

It was much nicer & more fun.

Yorch

I haven't traveled since, although I should

I think we're driving to Queretaro next weekend

my dad wanted to look at some land

copper.hat

I want to go :-)

There must be some lovely isolated places down near the Guatemalan border on the coast.

Yorch

Have you done roadtrips during covid

I know there's some beautiful places in Belize

copper.hat

I have gone nowhere except for Ireland (twice within a few months, unfortunately my mum passed away).

I loved Belize, but that was decades ago

We ended up in a place called San Ignacio

Yorch

I'm sorry to hear that

copper.hat

12:28 AM

If I travel it will be to visit my daughter in London

Thanks, it was very sad (still is) but not unexpected.

Yorch

Maybe you can make a roadtrip close to London?

I've only been to the airport in London though

So I'm not one to talk

copper.hat

Unfortunately for my daughter, she has lots of family in Ireland but the stupid quarantine thing screws everything up.

The quarantine thing is a nuisance (and expensive if I travel directly to London)

I have family there but they are all students :-)

Can't really land a 60 yo chap on top of them

leslie coin has arrived

causing climate change one computation at a time

Yorch

@copper.hat hahaha

leslie townes

it's really just one venmo transaction, and then i email a picture of a lesliecoin with your name written on it. if you like i could put a random hexadecimal string below that.

there's a blockchain involved but it's very eco friendly. what we go for with lesliecoin is the seamlessness of the transaction.

copper.hat

and completely untraceable

even by Soviet hackers

Yorch

12:36 AM

is lesliecoin friendly with the apple ecosystem?

leslie townes

i also accept bearer bonds and krugerrands

Yorch

I mean apple the company, not apple the fruit

copper.hat

i have a krugerrands somewhere

leslie townes

it's friendly with every ecosystem.

it's really going to revolutionize commerce. your life will never be the same. most people who buy lesliecoin immediately buy more.

copper.hat

most people who buy lesliecoin become destitute, i hear

leslie townes

12:37 AM

the buddha teaches that possessions burden the spirit.

or someone teaches that, anyway.

copper.hat

i have been looking at this nice spot in albany bulb

also a place under the 580/880 interchange

backup for when my investments hit some probability one random walk zero crossing

Yorch

1:32 AM

Albany Bulb: Exploring the Art in the Bay Area's Old Landfill

►

nice music

unless you know the person that made that music

in which case I wasn't being ironic

copper.hat

Never Sleep - Gunnar Olsen

Yorch

banger

leslie townes

2:15 AM

it grates to hear people say al-bany like the name al, instead of all-bany, although i do remember hearing it both ways in the bay area

my way is right

Ted Shifrin

2:34 AM

In GA the accent moves …

Ted Shifrin

2:47 AM

But, sadly, I have to agree with you re CA.

robjohn

2:59 AM

@TedShifrin where is the accent in GA?

. o O ( talkin' to ghosts, again )

leslie townes

in america, street names and the names of neighboring towns are a great way to catch a spy. i don't think a spy would last long in new england.

uhoh

0

Q: How (the heck) will New York City actually physically implement the ranked choice voting algorithm with thousands of unique mayoral votings possible?

Politico's New Yorkers pick a new mayor after chaotic, historic primary begins: NEW YORK — Polls have closed in New York City’s first ever ranked-choice election and, while the die has been cast, voters may not know the outcome for weeks. [...] Further extending the ballot count is the advent of...

are my math-words and numbers right?

Ted Shifrin

3:33 AM

@robjohn on the second sylla’ble

robjohn

@TedShifrin That is something I have never heard.

Ted Shifrin

I swear. Long a.

copper.hat

4:10 AM

Scheveningen

To distinguish German spies in The Netherlands.

copper.hat

4:26 AM

ffs, the batman equation question has been closed math.stackexchange.com/questions/54506/…

killjoys

Ted Shifrin

From 2011?

leslie townes

they should shut the door on 2010-2019. didn't do anybody any good

open older questions can stay open

ted, you'll like this. we have a 'timed exchange' of emails with the other side tonight. we have to exchange documents and nobody wants the other side to see theirs first and then make edits before they reply back, so we agree on a time. i proposed 9 and they came back with 10.

copper.hat

is there an escrow email service? there is always copper.hat escrow services...

it would seem that i am addicted to simple convex psqs

leslie townes

4:46 AM

we've done that kind of thing too. what we're doing now is called trust.

copper.hat

what???? what is this thing 'trust'?

leslie townes

5:10 AM

it went off without a hitch!

copper.hat

5:28 AM

excellent

AviFS

5:47 AM

What does this part in the description mean? I feel like I'm missing a good joke:

> Rarely if ever expressible as a ratio of integers.

copper.hat

rational

AviFS

Can't believe I missed that!

What part is/isn't rational, though?

user178758

the irrational part

copper.hat

you are reading too much into it...

user178758

@AviFS it means most of the chat is irrational

copper.hat

5:57 AM

that is true and false

leslie townes

i'm only rational with people who aren't rational with themselves

user178758

This sentence is false.

AviFS

@user178758 Now I see, haha

user178758

:-)

leslie townes

coke and pepsi are the same thing. wake up sheeple

copper.hat

5:59 AM

baaaaaaaa

there is rc cola

user178758

there are black sheep

copper.hat

my wife is listening to the us santa cruz new student intro.

reminds mw how incredibly complicated, expensive & demeaning college application is here

leslie townes

are they bragging about the terms of their zoom license? 'all the custom filters at no additional charge'

copper.hat

i'm only listening to every 3rd word

its mainly low bandwidth rah rah and disclaimers

all ahead of you

ah, apparently they offer birth control

leslie townes

so you know it's a good school

copper.hat

6:02 AM

ffs, these are college kids and this is part of the intro? don't they learn this in hs

i think school is delayed by a few years here

leslie townes

at least it's a video. i remember the UC had a mandatory overnight orientation program that should have been a website

copper.hat

overnight? jesus

leslie townes

it was such a waste of time

for enrollment in courses they took us to a classroom in evans with a bunch of telephones, and we sat down with paper course catalogs and dialed into the enrollment system

copper.hat

apoplexia is but a sentence away

leslie townes

i could have done that from home

copper.hat

6:04 AM

i hate stupid time waste and being treated like a child

leslie townes

you're just mad because you haven't had your juice

uncork another bottle of it

copper.hat

just had a glass

chloe, a nice pinot grigio

my wine from france arrived

leslie townes

is there such a thing? genuinely asking

copper.hat

i like pg

leslie townes

i'm probably biased because it is often the default 'white' at events where not a lot of the budget goes into wine

copper.hat

6:07 AM

my wine selection is based on following day impact

hard to find a nice white in my opinion

leslie townes

that's interesting. i tend to have that be more of an issue with reds

and oaked whites

copper.hat

i can find a reaonable red easily, but there are few whites that i like that are reliable

the focus always seems to be on the reds in my experience

i like reds, but when i prefer whites for working lunches ;-)

and roses are for my friends

leslie townes

a lot of california reds are alcohol bombs, french are a lot better

copper.hat

i like some california stuff, hafners and ilk, but Bordeaux's would be my general pref

i like to find a reliable obtainable wine. one spectacular bottle is no good

leslie townes

i don't think i've had wine since christmas

maybe that's why i'm in such a mood all the time

copper.hat

6:12 AM

christmas was where i discovered i had a lynch-moussas 2016 lying around

it was worth the wait

but the friends i brought it over to hid the bottle after opening

because they had other friends coming over who would guzzle without appreciating :-)

5 more bottles to go

calif reds tend to be a bit fruity for my taste

leslie townes

fruity alco bombs

copper.hat

very much so. i am long over the need for fast alcohol infusions

leslie townes

i like gruener veltliner, it's white, it often tastes like mineral water without the bubbles, and it tops out around 12%

there's a lot of bad cheap stuff though

copper.hat

i like austrian wines

i might pop down and see it if i can pick up some tmr.

i had forgotten about gruener veltliner

i am a little bored with my current pop

i used to drink a good bit of port before, but its a bit heavy in the evening for me now

leslie townes

it's very "old man, staring into the flames, ruminating on the past."

or upon death.

like that scene in the magnificent ambersons.

i forget if port was involved

copper.hat

6:22 AM

port and good cigars

i don't smoke, but like the smell of good tobacco

leslie townes

and i think the sense of smell is the first thing that goes if you do smoke, strangely

well it doesn't go, but you don't get the full impact

copper.hat

my son is too big for 3 of my 4 cars, his thighs rub on the steering wheel

leslie townes

i almost have that problem in my own car

copper.hat

never occurred to me that it might even be an issue

i may have to dispose of my lovely wrx

he wants an alfa romeo, but that's a little outside the budget at the moment

i can fully understand his wanting one

crap, its almost 23:30

good night! hope your timed exchange works out in your favour

leslie townes

goodnight

user178758

6:27 AM

cya

Koro

night

user178758

@AviFS it was put up by one of the original room owners

it's not really a good joke; but, a play on words

AviFS

It's not bad! Puns are totally a kind of humor :)

user178758

agreed :)

Prithu biswas

9:24 AM

What is structural induction ? I heard that strong induction can be proven from ordinary induction and ordinary induction Is one of the axioms of the peano axioms (axiom of induction). But then , which axiom system does structural induction come from?

Thorgott

see en.wikipedia.org/wiki/…

Prithu biswas

ZFC?

Thorgott

is that a question?

Prithu biswas

@Thorgott I mean does structural induction come from one of the axioms of ZFC?

Thorgott

no, it comes from logic, see the link

PM 2Ring

11:41 AM

@copper.hat There was a Batman logo thread on Code Golf a few years ago. I submitted two entries in sed, three in Python, and one in Conway's Game of Life. codegolf.stackexchange.com/q/126223/46655

Speaking of "equations" with cute graphs,

Tupper's self-referential formula

Tupper's self-referential formula is a formula that visually represents itself when graphed at a specific location in the (x, y) plane. == History == The formula was defined by Jeff Tupper and appears as an example in Tupper's 2001 SIGGRAPH paper on reliable two-dimensional computer graphing algorithms. This paper discusses methods related to the GrafEq formula-graphing program developed by Tupper.Although the formula is called "self-referential", Tupper did not name it as such. == Formula == The formula is an inequality defined as: 1...

Akiva Weinberger

12:45 PM

Letting (x_n,y_n) be the nth solution to the Pell equation and letting F_n be the nth Fibonacci number, both Pell and Fibonacci satisfy this property:

(F_k)^2 | F_m ⇒ F_k | m
(y_k)^2 | y_m ⇒ y_k | m

rostader

max_y min_x Ax -By can anything be said about finiteness of such an expression without knowing A and B. A and B are matrices. max and min are taken over the entire space of Rn

Akiva Weinberger

Should probably always be $-\infty$

Leaky Nun

@AkivaWeinberger which Pell equation is the Pell equation?

Akiva Weinberger

unless $A=0$

@LeakyNun $x^2-dy^2=1$ where $d=a^2-1$

so that the 0th solution is $(1,0)$ and the first solution is $(a,1)$

I should have specified

So $(x_n(a),y_n(a))$ really

$x_n(a)+y_n(a)\sqrt d=(a+\sqrt d)^n$

@rostader Wait, is $Ax$ a vector or a scalar?

Because if it's a vector then I don't know how you can minimize it

rostader

A is a matrix x is a vector B is a matrix y is a vector

Akiva Weinberger

12:52 PM

Sure, but is Ax a vector?

rostader

Ax is a vector

Akiva Weinberger

Right so what does min_x Ax mean

rostader

min_x Ax - By gives the x* = A^TA^inv A^TBy

You can again take a maximization over that

I should have mentioned in L2 norm

PM 2Ring

1:09 PM

@AkivaWeinberger BTW, you get Fibonacci & Lucas numbers from the solutions to the generalised Pell equation related to phi, $x^2-5y^2=\pm 4$. You might enjoy playing with the PQA algorithm. mathafou.free.fr/exe_en/exepqa.html

copper.hat

1:27 PM

@rostader you need to be clear about what you are asking.

@PM2Ring that is very cute (Tupper's thingy)

Yorch

1:47 PM

it got closed and locked?

gold

and the last answer is from 2016

hahaha

well, all it takes is for one person to vote to close to get in the close review

actually I don't know that for sure

copper.hat

2:35 PM

looking forward to getting my official 'you have been suspended from mse for bad behaviour" certificate

user178758

more "wirey" behaviour?

:-)

vitamin d

Hello! What happens if we include infinite measures in the BCT? Is there a trivial counterexample then?

copper.hat

:-) I didn't quite understand that "wirey personality" remark of Alexander's :-)

@vitamind try $f_n = {1 \over n} 1_{[0,n]}$.

ronak jain

copper.hat

that's a cute picture

2

user178758

2:50 PM

in The h Bar, 14 mins ago, by ronak jain

I have a question ... May I post it here ?

~~question~~ cute picture

ronak jain

Why I can't put x = y = z in the second part of question using AM GM inequality ?

@copper.hat is this for the question ? What is cute in it ?

copper.hat

Is there some context here, are $x,y,z$ integers?

ronak jain

Yes

vitamin d

@copper.hat In this case $\lim_{n\to\infty}f_n=0$. So the left hand side (where the limit is inside the integral) is equal to zero. The right hand side is equal to $1$ then?

copper.hat

yes

@ronakjain I still do not understand.

Are $x,y,z$ integers?

ronak jain

2:58 PM

@copper.hat yes they are positive integers

user178758

in The h Bar, 13 mins ago, by ronak jain

In the second part of the question I posted ... Why I can't put x = y = z ? Using AM GM inequality. Though in this case I know it is a plane so its value will be normal distance of plane from origin
But why AM GM inequality not work ?

copper.hat

@user178758 how come you know about wirey behaviour but have a 1 rep?

:-)

ronak jain

@LeakyNun Any idea about the question ?

Leaky Nun

because the coefficients of x,y,z (in the constraint) and also the powers (in the value to be optimized) are different among themselves

i.e. the situation is not symmetric in x,y,z

ronak jain

If there was no constraints given than for any value of x, y,z optimum value would be when x = y = z . And the constraint also allows me to do so ... Than why this is not valid ?

@LeakyNun sometime we change the powers to be optimised by writing 2x = x + x and so... Then why is it necessary for situation to be symmetric in x, y and z

robjohn

3:27 PM

$$\overbrace{\frac12\left(\frac x2\right)+\frac13(y)+\frac16(3z)}^1\ge\overbrace{\left(\frac x2\right)^{1/2}(y)^{1/3}(3z)^{1/6}}^{\left(\frac38x^3y^2z\right)^{1/6}}$$

copper.hat

adding overbrace to my little collection

user178758

now, that is a cute picture

@ronakjain^

Avra

3:51 PM

hello @user178758/

Are you familiar with counting please? I have small issue about counting

nope, sorry

Hi @Ted

@Avra Askaway

We have $2^n$ rows for $n$ variables in the truth table, so in total we have two possibilities for each row, either True or Flase, for all rows, we have 2 values (true, false): $2~values(true,false) ~~ \times (2n) ~times ~~\times 2~values(true,false)=2^{2n}$. Is that correct please?

Alessandro Codenotti

Hi @Balarka

Want to hear something weird?

Transcript for

$Mathematics$ Mathematics