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3h
answered Why would the Jacobian not be zero in this case?
16h
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1d
comment How to use Cauchy's integral formula with more than one pole?
en.m.wikipedia.org/wiki/Residue_theorem
Apr
15
comment Chess Probability 8 rooks
"Blocked" means that you can't place rooks there or that you can't place rooks there and two rooks that are on the same row of the blocked square can't hit each other?
Apr
15
comment Understanding angle-preserving definition
What's wrong with this question?
Apr
15
asked Understanding angle-preserving definition
Apr
11
comment Can anyone clarify why this is?
Ah I see. thank you :-)
Apr
11
revised Expected distance of a moving object
added 1 character in body
Apr
11
comment Expected distance of a moving object
Please add other details as your question is not clear at all
Apr
11
comment Can anyone clarify why this is?
I'm aosrry but I don't understand.. Once you get to $\int_0^{2\pi}\int_0^Re^{-r^2}r\,\mathrm{d}r\,\mathrm{d}\theta$ can't you just solve it like $= 2\pi \left|- e^{-r^2}/2\right| ^R_0 = \pi (-e^{-R^2}+1) \to \pi$ ?
Apr
11
revised argument of $z = \sqrt 5 + 5i$?
added 21 characters in body; edited title
Apr
11
revised argument of $z = \sqrt 5 + 5i$?
added 21 characters in body; edited title
Apr
11
answered argument of $z = \sqrt 5 + 5i$?
Apr
10
comment Can anyone clarify why this is?
Why use the squeeze theorem when one can just use polar coordinates to directly find the result?
Apr
10
answered Proving properties about matrix $A$ s.t. $A^2 = -I$
Apr
10
comment Borel sigma-algebra over [0,1]
Ah I see. I've used another definition for $\sigma$-algebra then :-)
Apr
10
comment Borel sigma-algebra over [0,1]
What do you mean prove? The first fact comes from the definition of $\sigma$ - algebra
Apr
7
comment $\phi(n)/n$ is minimal
Is equal to $1$.. Just search for totient function on Wikipedia ;-)
Apr
7
comment Estimating the value of a stock
I just said that because I read the "German tank problem " on wiki (search that, it's an awesome read) and maybe something can be said
Apr
7
comment Estimating the value of a stock
If you only know how many products you have and a range of possible prices without any other information, then it's not possible to find an average cost. You can say that the average cost has to be in some interval (between the lowest and highest price) but that's it. An interesting approach would be to do educated guesses using some statistical tools but it's quite complex. Anyhow on this regard you may wait for someone else or ask on stats.stackexchange.com