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Jun
5
revised Recommend a concise book on mathematical logic
edited tags
Jun
4
revised Sequences identity
added 2 characters in body; edited tags
Jun
1
comment Fundamental theorem of calculus and complex integration
Ok, then yes. I was much disturbed by one of your sentence (the one in italic in my first comment). It's not that irrelevant to the question. Sorry anyway :o)
Jun
1
comment Fundamental theorem of calculus and complex integration
"The fact that the unit circle contains 0, on which neither cosec(z) nor cot(z) is defined is irrelevant. The only thing that matters is that the statements above hold true on the path itself." No, this is wrong.
Jun
1
revised Changing integration order in $\int_0^4\int_0^1\int_{2y}^2 \frac{4\cos (x^2)}{2\sqrt{z}}\,\mathrm{d}x\,\mathrm{d}y\,\mathrm{d}z$
added 45 characters in body; edited title
Jun
1
comment Why spherical coordinates is not a covering?
@Martigan It's the idea, but it won't work as is, because for example with $\varphi \in (\pi/2, \pi/2+\pi)$, you don't get a bijection : it's neither injective nor surjective.
Jun
1
comment Why spherical coordinates is not a covering?
"Length" $2\pi$ on the $\theta$ side, but $\pi$ on the $\varphi$ side.
Jun
1
comment Probability of 10 coin flips?
@Tyler And even if it's not needed to consider the whole sample, it does not harm either, so your answer is right.
Jun
1
comment Why spherical coordinates is not a covering?
I'm not sure if it's what causes trouble to you, but a covering map needs not be bijective, it has only to be surjective. Maybe have a look at covering space on Wikipedia.
May
31
revised Showing that $x^4 -2x^2 +8 x+1$ is irreducible over $\Bbb Q$
edited title
May
31
revised Prove that $\int\frac{1}{x^2-a^2}dx=\frac{1}{2a}\ln|\frac{x-a}{x+a}|+\zeta$ using trigonometric substitution
added 33 characters in body
May
30
comment Website with possible closed forms of numbers
Or maybe Plouffe's inverter, now offline and replaced by isc.carma.newcastle.edu.au
May
30
revised Difficult to understand difference between the estimates on E(X) and V(X) and the estimates on variance and std.dev. on lambda-hat
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May
29
revised Coproduct of projective schemes
edited title
May
28
revised Find the correct betting combination
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May
27
comment Find the correct betting combination
@AlexeyBurdin is it really 3,5,7,17,22 ? I mean, if you bet t/3 on the first, you will only have 2t/3 left if it wins. With a total bet of t, it's a loss. Or you mean you also recover your bet, but I thought it was the meaning of the first "Rs.1" in what you get.
May
27
comment Find the correct betting combination
I guess $Rs$ means rupees (you may remove the money symbol, as it's useless, and is unclear in many countries). Is the gain proportional to the bet? I mean, if I bet $n$ rupees on team $5$ and I win, will I win $21n$ rupees?
May
27
answered Derive probability mass function from probability-generating function
May
27
revised What is the probability that 5 randomly chosen cards in a deck add up to 40 or greater?
for completeness
May
27
comment What is the probability that 5 randomly chosen cards in a deck add up to 40 or greater?
Thanks! I'm glad we finally get the same answer. :)