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Is the product of symmetric positive semidefinite matrices positive definite?

linear-algebra matrices positive-semidefinite asked Feb 27, 2012 at 3:36

math.stackexchange.com

58 votes

Do We Need the Axiom of Choice for Finite Sets?

set-theory axiom-of-choice asked Apr 16, 2012 at 22:23

math.stackexchange.com

30 votes

Moment generating functions/ Characteristic functions of $X,Y$ factor implies $X,Y$ independent.

probability-theory reference-request characteristic-functions asked Jan 26, 2013 at 5:31

math.stackexchange.com

30 votes

Basic jq usage. How to get nested value

json key jq asked Jan 18, 2017 at 5:58

stackoverflow.com

27 votes

Need help understanding separable polynomials

field-theory galois-theory asked May 19, 2012 at 20:43

math.stackexchange.com

27 votes

Does a closed and bounded set in $\mathbb{R}$ necessarily contain its supremum and infimum?

real-analysis general-topology asked Oct 25, 2011 at 2:46

math.stackexchange.com

26 votes

Why $\sigma$-algebras represent information, and what information does $\sigma(X)$ represent?

measure-theory probability-theory asked Jan 23, 2013 at 3:12

math.stackexchange.com

22 votes

Mathematics of Torrenting

reference-request computer-science asked May 24, 2013 at 18:18

math.stackexchange.com

20 votes

Examples of properties that hold almost everywhere, but such that explicit examples are not known

measure-theory big-list asked May 17, 2013 at 16:32

math.stackexchange.com

19 votes

How to show convolution of an $L^p$ function and a Schwartz function is a Schwartz function

homework measure-theory harmonic-analysis convolution lp-spaces asked Nov 17, 2012 at 3:30

math.stackexchange.com

Top Answers

Eyebrow-raising pattern of number of primes between terms of the Fibonacci number sequence?

math.stackexchange.com

A simple way to obtain $\prod_{p\in\mathbb{P}}\frac{1}{1-p^{-s}}=\sum_{n=1}^{\infty}\frac{1}{n^s}$.

math.stackexchange.com

Interior of a convex set is convex

math.stackexchange.com

Proving that the dual of the $\mathcal{l}_p$ norm is the $\mathcal{l}_q$ norm.

math.stackexchange.com

If ord$(a)=m$, ord$(b)=n$ then does there exist $c$ such that ord $(c)=lcm(m,n)$?

math.stackexchange.com

Vim: execute current file?

stackoverflow.com

Your favourite application of the Baire Category Theorem

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Uniform Convergence Implies $L^2$ Convergence and $L^2$ Convergence Implies $L^1$ Convergence

math.stackexchange.com

Appropriate Notation: $\equiv$ versus $:=$

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If $X$ and $Y$ are independent, then $f(X)$ and $g(Y)$ are also independent.

math.stackexchange.com

Why do people write stochastic differential equations in differential form?

math.stackexchange.com

Multiplying two inequalities

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How to get PDF from characteristic function

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Is there a nice open set proof that multiplication is continuous?

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integration of a continuous function $f(x) $ and $xf(x)$ is zero

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Prove that the open interval $(0, 1)$ contains uncountably infinite numbers.

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Example of sequences with different limits for two norms

mathoverflow.net

How to create PDF of slides with audio?

academia.stackexchange.com

Configure tor as proxy

tor.stackexchange.com

Need some help on a non-example of equicontinuity

math.stackexchange.com

Prove that the CDF of a random variable is always right-continuous

math.stackexchange.com

definition of limsup of a function

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Basis of $C[a,b]$

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All partial derivatives are 0.

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How to prove $I + t X$ is invertible for small enough $ | t | ?$

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prove that the set of rational numbers is not connected on the real line

math.stackexchange.com

Are the random variables $X + Y$ and $X - Y$ independent if $X, Y$ are distributed normal?

math.stackexchange.com

Why do some divergent series apparently seem to converge (e.g. Grandi's series)?

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Nilpotent commutative matrices $A, B$ $\Longrightarrow$ $A+B$ nilpotent.

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What is "every inductive set"?

math.stackexchange.com