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An expert is a man who has made all the mistakes, which can be made, in a very narrow field. (Niels Bohr)


Dec
6
reviewed Close Is it true that $A \geq B$ implies $\|A\|_2 \geq \|B\|_2$ for $A,B \geq 0$?
Dec
6
reviewed Close Finitely generated modules
Dec
6
reviewed Leave Open Show $\lim_{n\to\infty}\frac{\int_X|f|^{n+1}d\mu}{\int_X|f|^nd\mu}=\|f\|_\infty$.
Dec
6
reviewed Close Show that $\mathbb{Z}_n$ is local ring iff $n$ is a power of a prime number
Dec
5
reviewed Close prove that $\sum_{n=0}^{\infty} \frac{x^n}{n!} > 0$
Dec
5
reviewed Close Is the series $\sum_{1}^{\infty}\frac{1}{p_{j}}$ where $p_{j}$ is the $j$th prime convergent?
Dec
5
reviewed Close Finding matrix for given recurrence
Dec
5
reviewed Close Find the conditional expectation $E[X|X\wedge t]$
Dec
5
reviewed Close What is the probability $X+Y=0$ for two independent Poisson random variables?
Dec
5
reviewed Close Find a constant $c$ (if it exists) such that $Y_n \xrightarrow{P} c$. Does $Y_n \xrightarrow{a.s.} c$?
Dec
5
reviewed Close Are there numbers such that A + B = 10A+B?
Dec
5
reviewed Close Prove that $f(x) = 0$ for all $x ∈ R$.
Dec
4
reviewed Close Convergent sequence?
Dec
4
reviewed Close Area between $1$ and $2$ of $x^2$ and $x^{1/2}$ using integrals?
Dec
4
comment find the upper bound on a vector
@user189013 yes, if $f:\mathbb{R}^d\to \mathbb{R}^d$ is $C^r$ for $r\geq 2$.
Dec
3
reviewed Close Prove an artificial variable that leaves the basis will never return.
Dec
3
reviewed Close Find positive integer d of the additive group Z?
Dec
2
reviewed Leave Open Corollary from Maximum Modulus Principle and Schwarz's Lemma
Dec
2
reviewed Leave Open Let $A_{j,k} = \langle x_j, x_k\rangle$. Show $A$ is invertible if and only if $x_1, \ldots, x_n$ are linearly independent.
Dec
2
reviewed Close Showing martingale property of a series