User Empiricist

71 votes

Accepted

Is it possible to construct a sequence that ends in 1000000000?

answered Aug 16, 2015 at 9:31

28 votes

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Derivative of the $l_p$ norm

answered Oct 16, 2015 at 2:57

24 votes

How do I prove that a matrix is a rotation-matrix?

answered Nov 15, 2014 at 10:57

22 votes

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Shouldn't this function be discontinuous everywhere?

answered Mar 3, 2015 at 11:58

18 votes

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Expansion of the square of the sum of $N$ numbers

answered Mar 13, 2015 at 2:07

18 votes

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Proof that the intersection of any finite number of convex sets is a convex set

answered Nov 11, 2014 at 5:35

15 votes

sum and product of Lipschitz functions

answered Nov 19, 2014 at 9:53

14 votes

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calculation $f(x)$ from given expression

answered Nov 29, 2014 at 13:01

13 votes

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If $x$ and $y$ are irrational but $x + y$ is rational then $x - y$ is irrational

answered Apr 1, 2015 at 6:51

13 votes

Solving an equation with exponentials

answered Dec 11, 2014 at 3:37

10 votes

Row space and column space for SVD

answered Nov 17, 2014 at 9:14

9 votes

How can I prove the inverse of a function is odd?

answered Apr 8, 2015 at 2:02

9 votes

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$l^p$ space not having inner product

answered May 28, 2015 at 5:28

8 votes

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What is the meaning of $e^{int}$ notation

answered Jun 11, 2016 at 7:09

7 votes

demostration of interger part integration.

answered Jul 27, 2015 at 5:53

7 votes

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Events $A_n\uparrow A$ meaning. $A_n\downarrow A$ meaning.

answered Jan 2, 2015 at 8:50

6 votes

How to find the LCM of three numbers?

answered Jan 12, 2015 at 8:13

6 votes

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$ \frac{1}{2} + \dots + \frac{1}{n} \le \log n $

answered May 13, 2015 at 21:34

6 votes

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Find the remainder when $1!$+$2!$+$3!$....$49!$ is divided by 7?

answered Nov 2, 2015 at 10:37

5 votes

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Show that $P^2$ = $P$

answered Dec 1, 2015 at 5:48

5 votes

Accepted

Prove/disprove $||A^2|| \leq ||A||^2$ for a nxn matrix

answered Jan 21, 2016 at 1:20

5 votes

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Simplifying $\frac{1}{\sqrt{-1}}$

answered Aug 13, 2015 at 4:20

5 votes

A Type of Union I do not understand

answered Aug 26, 2015 at 0:18

5 votes

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How to find the value of this summation equation?

answered Jan 12, 2015 at 2:37

5 votes

Accepted

How to use dominated convergence theorem?

answered Dec 11, 2014 at 3:41

5 votes

Proof of an addition theorem

answered Nov 15, 2014 at 10:04

4 votes

Prove $f$ is continuous iff for every closed set $K$ in $\mathbb R$, the set $f^{-1}(K)$ is closed in $\mathbb R$

answered Nov 14, 2014 at 13:05

4 votes

Accepted

symbol for maximum number in an array or vector

answered Dec 3, 2014 at 12:19

4 votes

What is the coefficient of $x^{18}$ in the expansion of $(x+x^{2}+x^{3}+x^{4}+x^{5}+x^{6})^{4}$?

answered Jan 8, 2015 at 4:36

4 votes

Accepted

Proximal Operator of $ f \left( U \right) = -\log \det \left( U \right) $

answered Feb 25, 2015 at 4:27

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235 Answers

Is it possible to construct a sequence that ends in 1000000000?

Derivative of the $l_p$ norm

How do I prove that a matrix is a rotation-matrix?

Shouldn't this function be discontinuous everywhere?

Expansion of the square of the sum of $N$ numbers

Proof that the intersection of any finite number of convex sets is a convex set

sum and product of Lipschitz functions

calculation $f(x)$ from given expression

If $x$ and $y$ are irrational but $x + y$ is rational then $x - y$ is irrational

Solving an equation with exponentials

Row space and column space for SVD

How can I prove the inverse of a function is odd?

$l^p$ space not having inner product

What is the meaning of $e^{int}$ notation

demostration of interger part integration.

Events $A_n\uparrow A$ meaning. $A_n\downarrow A$ meaning.

How to find the LCM of three numbers?

$ \frac{1}{2} + \dots + \frac{1}{n} \le \log n $

Find the remainder when $1!$+$2!$+$3!$....$49!$ is divided by 7?

Show that $P^2$ = $P$

Prove/disprove $||A^2|| \leq ||A||^2$ for a nxn matrix

Simplifying $\frac{1}{\sqrt{-1}}$

A Type of Union I do not understand

How to find the value of this summation equation?

How to use dominated convergence theorem?

Proof of an addition theorem

Prove $f$ is continuous iff for every closed set $K$ in $\mathbb R$, the set $f^{-1}(K)$ is closed in $\mathbb R$

symbol for maximum number in an array or vector

What is the coefficient of $x^{18}$ in the expansion of $(x+x^{2}+x^{3}+x^{4}+x^{5}+x^{6})^{4}$?

Proximal Operator of $ f \left( U \right) = -\log \det \left( U \right) $