Mathematics - 2021-09-11 (page 4 of 4)

copper.hat

20:09

@JackOhara Did you resolve your probability question?

Jack Ohara

Yes sir !

it was like you and Ted told me haha

but it can be solved also with the way i thought of it first, but it is basically same calculations but different perspectives

I did not solve it but robjohn did :D

@copper.hat he also asked a follow up question, that would it be better to bet odd number of times or even

I am not even sure how to tackle that problem

copper.hat

I think I missed the odd/even question, I was referring to the 10/5 card problem.

Jack Ohara

Yes that question is solved

copper.hat

Just curious, I can't help much at the moment, too much work :-(.

Its hard to follow threads in this chat.

Jack Ohara

haha no worries :)) thanks for the help yesterday

yeah too much going on at once

but i think if you click on "load to my last message " few times

you should be able to see what robjohn wrote there

it was what you and Ted also talked about

copper.hat

20:21

I am no stranger to these computations but rarely find them intuitive :-).

Balarka Sen

we're no strangers to these computations / you know the rules and so do i / no conditioning is what im thinking of / you wouldn't get this from rolling a die

Ted Shifrin

Balarka waxes iambic again.

Balarka Sen

i should really get back to writing a talk

copper.hat

"writing a talk" almost seems wrong :-)

Balarka Sen

good observation

copper.hat

20:31

i am a walking contradiction.

Ted Shifrin

Not bicycling?

leslie townes

ted, the biggest tennis fan among my friends is 'boycotting' the us open because she doesn't want to see djokovic win. an event that she thinks is highly likely.

i'm sure if he knew he would be heartbroken.

Ted Shifrin

I get it. The two teenage women are phenomenal.

Semiclassical

whence the Djokovic disdain? I don't follow tennis

copper.hat

Cycled to Emeryville and environs early this morning. Gorgeous out.

Trying to decipher UCSC move in instructions. In light of my son's Covid a month ago.

leslie townes

20:35

semi, i don't know, but per my friend i have gathered that his off the court behavior is contemptible. she says he is something unprintable.

Ted Shifrin

Arrogant self-centered, tantrums. Anti-vax, although most professional tennis players are. But got bunches of players sick with COVID last year in Serbia.

leslie townes

copper, an hour or two in sheep dip should clear him for move-in

Ted Shifrin

Yes, he was disqualified from the US Open for whacking a ball in anger.

copper.hat

20:51

I get drawn into ivermectin 'discussions' periodically. Always try to worm my way out of these convos.

I would never have survived as an American college student.

Unbelievably complicated.

robjohn

@copper.hat going to Santa Cruz? My friend's daughter is going to Santa Cruz.

copper.hat

Supposedly he is doing game design (CS) whatever that is. I am happy that he is going to college.

robjohn

@copper.hat crowded field. If he is good in art or programming, it might be good. The backstory and testing is pretty crowded.

copper.hat

I knew the ex chancellor Pister, unfortunately not there anymore.

@robjohn To be honest I do not really know his interests (apart from playing games). I tried but only so much I can do.

robjohn

@copper.hat same here. My son is a high functioning autistic, but he is hard to separate from his computer.

copper.hat

20:56

My daughter's interests are more similar to my own. She can handle a soldering iron adequately, etc. My son had no interest.

I did not have much relationship with my own dad, I was hoping that 2.0 would be better but I have failed.

robjohn

My son can't draw and he has no interest in programming, so he is interested in writing backstory or testing. Testing is what everyone wants to do.

copper.hat

I think they want to do testing until they actually do it. They think it is playing games.

robjohn

yep

copper.hat

It really becomes playing a short segment of a game again and again.

On different hardware, Etc.

I worked (long story) at Samsung a few years ago and got to see a lot of their testing for video games. Illuminating.

They have the best cafeteria of the large South Bay companies.

Including Apple, etc.

I am hoping my son finds his way. I believe I can help him in many ways, but you can bring a horse to ivermectin, but you can't make him take it.

need to do quarterly taxes today. painful.

Ted Shifrin

@copper This is down your alley.

robjohn

21:15

@copper.hat I have been after our preparer about some things she said were needed.

Ted Shifrin

@robjohn Take a look at that link, too. Perhaps one of you can help.

robjohn

@TedShifrin I think that there are people who go through questions and if there is no work shown, immediately vote to close without any understanding of the question. You can tell that that question is not a problem statement.

@TedShifrin I was :-)

Ted Shifrin

The vote to close is idiotic.

Although I got confused and didn’t help.

robjohn

People asking because they have a hole in their knowledge are not asking a PSQ, and it is hard to add context to something you simply don't understand.

Ted Shifrin

This is subtle. I don’t know if there is an answer.

robjohn

21:22

I will go back and look more, I was just annoyed at the close vote

I deal with enough knee-jerks every day

Semiclassical

21:36

in fairness, the glut of actual PSQs makes it easy to react too aggressively

Ted Shifrin

And here is another idiotic close vote.

leslie townes

i wonder if even the formulation involving P_n is itself a specialization of something. i could imagine a number of complex analysis exercises turning on something like that without requiring an exact form. it certainly isn't a duplicate of the other question.

Xander Henderson

21:59

@TedShifrin Can you expand on that a little? As far as I can tell, the one close vote is to close the question as a duplicate of a question about finding the roots of a polynomial ("Why is it so hard to find the roots of polynomial equations?").

It is not clear to me that this is necessarily the right course of action (I would be more inclined to first get clarity about what they mean by "solving" such a thing (in terms of radicals? in terms of other "well known" special functions? numerically?)), but I don't think that we need to sink to incivility and call the close voter "idiotic".

Ted Shifrin

I didn’t call the voter anything.

I think there are sensible comments. This is not a do-my-homework question.

Then there are questions where the OP can’t even be bothered to look up and learn the definition of a multivariable derivative. I commented to that effect but didn’t vote to close. I rarely do.

Xander Henderson

No one claimed it was a do-my-homework question.

The claim is that it is a duplicate question.

Ted Shifrin

OK, I didn’t look at that.

Copycat posters?

Xander Henderson

No. As I said in my comment above, the dupe target is a general question about the difficulty of finding the roots of a polynomial. It is arguably relevant in this case.

If the question really is about finding roots in terms of radicals, there are answers there which seem appropriate. My feeling is that the question would more appropriately be closed for lack of clarity (again, what does it mean to "solve" a polynomial equation? what form of solution is sought?), but even then, I am not claiming it is a "do-my-homework" problem.

Ted Shifrin

22:19

Here is one that had to have several dupes, but I just answered rather than searching. On my iPad (which is where I was at the time), searching is a pain in the ass.

copper.hat

22:35

@TedShifrin Too late to help, I added a comment to the question.

@robjohn I am the preparer in this instance. I am a contractor so I need to pay my estimated taxes. Thankfully this was a good year, but that means parting with a chunk around this time.

M R James 2017

23:14

Good afternoon everyone, I need a little verification, I don't want to post it as question, if would be nice if any of you verify the following and message me, thanks:

this is from Zassenhaus Lemma.Let $H', H, K',$ and $K$ be subgroups
of a group $G$ such that H' is a normal subgroup of $H$ and $K'$ is a normal
subgroup of $K$. Set $J = (H \cap K')(H' \cap K)$. Define the function $f: H'(H\cap K) \rightarrow (H\cap K)/J$ as follows: If $a \in H'(H\cap K)$, then $a = h'b$, where $h' \in H'$ and $b \in H \cap K$. Set $f(a)=Jb$. it is already proven that the function $f$ is well defined and a…

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