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7h
awarded  Enlightened
8h
awarded  Nice Answer
2d
revised Which derivatives are eventually periodic?
more descriptive title
Feb
7
answered Analyticity of $\overline {f(\bar z)}$ given $f(z)$ is analytic
Feb
3
comment Is $k+p$ prime infinitely many times?
Wait, never mind, the "infinitely many" makes it different than that.
Jan
28
comment Probability that at least one of the bullets will go on forever.
It's possible that a bullet will travel forever even if there's a later, faster bullet (because some third bullet interposes itself between them).
Jan
25
comment Low-degree “determinant” for non-square matrices?
If I'm reading this right, you need some additional assumptions about $\Bbb{F}$ for your polynomial to work. For example, when $n=1$, it ends up being the sum of the squares of the matrix elements, which can be zero even when the matrix has full rank if, say, $\Bbb{F}=\Bbb{C}$...
Jan
23
answered Prove the triangle is equilateral
Jan
21
revised Prove $G$ is a group (unusual star operation).
formatting
Jan
12
revised P is a natural number. 2P has 28 divisors and 3P has 30 divisors. How many divisors of 6P will be there?
I think this is what you meant; TeX precedence is really dumb sometimes...
Jan
12
revised Is $\lfloor n!/e\rfloor$ always even for $n\in\mathbb N$?
grammar/spelling
Jan
12
revised Is $\lfloor n!/e\rfloor$ always even for $n\in\mathbb N$?
added 41 characters in body
Jan
11
comment Five points in the plane are given, no three of which are collinear. Show that some four of them form a convex quadrilateral.
Draw a line through the two interior points. Two of the vertices lie on one side of that line...
Jan
11
comment Five points in the plane are given, no three of which are collinear. Show that some four of them form a convex quadrilateral.
en.wikipedia.org/wiki/Happy_ending_problem
Jan
8
answered Average marks : then and now.
Dec
24
awarded  Nice Answer
Dec
19
reviewed Approve Show that $S_p=\langle \tau,\sigma \mid \tau^2,\sigma ^p\rangle$
Dec
13
answered After 6n roll of dice, what is the probability each face was rolled exactly n times?
Dec
12
comment Toss a fair die until the cumulative sum is a perfect square-Expected Value
@SandeepSilwal: I'd call it a variant of the St. Petersburg paradox. Basically, if you are convinced by any proposed solution to that, there should be an analogous solution to this that you find equally convincing. But the root issue is that expected value isn't a good tool for studying this kind of infinite game...
Dec
11
comment Annuity that pays $t^2$ at time $t$ in arrears annually.
Do you know/are you allowed to use calculus? Because there's a slick solution that involves taking derivatives, and a somewhat messier solution along the lines you've laid out...