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Feb
1
comment integration method
This answer from over two and a half years ago suddenly got a flurry of upvotes - anyone know why?
Jan
31
comment Is this number rational or irrational?
@HagenvonEitzen Thanks. This question was actually inspired by this topic on Hacker News.
Jan
31
comment Coin flipping probability game ; 7 flips vs 8 flips
I would also be perfectly willing to accept the intuitive explanation as a proof. In fact, it's a strictly better proof than the one given, because it immediately generalizes to the case where your friend flips $n$ times and you flip $n+1$ times for $n\geq 0$.
Jan
31
comment Is this number rational or irrational?
@Martín-BlasPérezPinilla How long did it take you to come up with this argument? Did you see it instantly?
Jan
31
asked Is this number rational or irrational?
Jan
28
comment Few calculus questions
Hi. It looks like you are new here. We are generally very willing to help, but we like users to show the work that they've done towards solving the problem on their own first. If you can edit your question to show what you've done so far, and where you are stuck, then you will get a much better response.
Jan
23
reviewed Approve Derivative of sqrt( Vector * Matrix * Vector ) according to one coordonate of the vector
Jan
23
answered Derivative of sqrt( Vector * Matrix * Vector ) according to one coordonate of the vector
Jan
15
awarded  Enlightened
Jan
15
awarded  Nice Answer
Jan
15
comment Why isn't $\int\sin(ix)~dx$ equal to $i\cos(ix)+C$ ?
@Lucian The law in the land of Mathematics is "unequal until proven equal" ;)
Jan
15
answered Why isn't $\int\sin(ix)~dx$ equal to $i\cos(ix)+C$ ?
Jan
14
comment Rational probabilities
@Did Oh, I misunderstood! I Assumed you were giving a reason that my example couldn't be a measurable space, and somehow twisted your words to mean something they didn't.
Jan
14
comment Rational probabilities
@Did Interesting - in what way does $2^\mathbb{N}$ fail to be a sigma algebra?
Jan
14
comment Rational probabilities
Interesting. I had initially written "consider only countable sample spaces" but decided to remove it to make the question more general. Any reason not to use a measure taking values on $\mathbb{Q}$ if you have a countable sample space (the sigma algebra could still be uncountable, I think, eg if $\Omega=\mathbb{N}$ and $F=2^\mathbb{N}$)
Jan
14
asked Rational probabilities
Jan
10
awarded  Good Answer
Jan
10
comment How to compute the output of floating numbers?
No problem - it's good to have you here at Math Stack Exchange!
Jan
10
revised How to compute the output of floating numbers?
added 16 characters in body
Jan
10
revised Explain cosmic distances to a child
added 218 characters in body