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Dec
11
reviewed Approve Some users are mind bogglingly skilled at integration. How did they get there?
Dec
11
answered Chance of having score of 63
Dec
10
comment What is the probability that a Poisson random variable is prime?
Asymptotically I'd expect $Q(\lambda, 0)$ to be "the probability that a number near $\lambda$ is prime", i. e. about $1/\log \lambda$.
Dec
10
reviewed Reject I'm having difficulty with this limit. Lim as x approaches 2: [(1/x-2)-(4/x^2-4)]
Dec
10
reviewed Approve Is the Product of Banach Spaces a Banach Space?
Dec
9
answered Why is this true? (sum of 2 uniform distributions)
Dec
9
reviewed Approve Third order piecewise cubic taylor approximation
Dec
9
comment Can you select random entry from unknown number of entries?
If I recall correctly this is called "reservoir sampling", also worth googling.
Dec
8
reviewed Approve If $A$ and $B$ are not countable. Is $A \cup B$ not countable and vice versa
Dec
8
reviewed Approve How many triangles in the picture?
Dec
8
comment Why is $\frac {1\cdot2\cdot3\cdot…\cdot n}{(n+1)(n+2)…(2n)}\le \frac 1 {n+1}$
See my edits to answer that question.
Dec
8
revised Why is $\frac {1\cdot2\cdot3\cdot…\cdot n}{(n+1)(n+2)…(2n)}\le \frac 1 {n+1}$
added 301 characters in body
Dec
8
answered Why is $\frac {1\cdot2\cdot3\cdot…\cdot n}{(n+1)(n+2)…(2n)}\le \frac 1 {n+1}$
Dec
8
awarded  Caucus
Dec
5
comment Chance on pairs when picking 'Sinterklaas tickets'
In the limit of large $n$, the number of 2-cycles of a permutation on $n$ elements is Poisson-distributed with mean $1/2$. (For $k$-cycles, it's $1/k$.) In particular, it's zero with probability $e^{-1/2}$. Restricting to derangements doesn't change this too much. This is a high-level explanation for the asymptotic result quoted in OEIS.
Dec
4
reviewed Edit Can one give me some concrete examples explaining Picard's Great Theorem
Dec
4
revised Can one give me some concrete examples explaining Picard's Great Theorem
corrections
Dec
4
answered What does $\overline{z}\mathbb{1}$ and $\underline{z}\mathbb{1}$ mean?
Dec
4
answered Why is it that $f(x)$ is even if $f(-x) = f(x)$?
Dec
3
reviewed Reject and Edit Show that $f$ is a bivariate density