User Marcin Łoś

24 votes

Can one differentiate an infinite sum?

answered Feb 9, 2015 at 11:27

22 votes

Accepted

Limit with a big exponentiation tower

answered May 25, 2014 at 21:23

16 votes

Accepted

Condition for continuity of bilinear form

answered May 25, 2014 at 18:37

10 votes

Accepted

continuity and existence of all directional derivatives implies differentiable?

answered May 6, 2014 at 22:47

7 votes

Find limit of this recursive sequence

answered May 15, 2014 at 2:20

5 votes

Convergence of power towers

answered May 19, 2014 at 1:20

5 votes

Accepted

$L^1$-convergence implies $L^p$-convergence

answered May 5, 2014 at 20:07

5 votes

Accepted

Question about proof of FTA

answered Mar 6, 2014 at 23:04

4 votes

About linear bijection between Banach spaces!

answered Mar 2, 2014 at 9:38

4 votes

Accepted

If $\kappa$ is an inaccessible cardinal then $|V_\kappa|=\kappa$

answered Mar 5, 2014 at 15:04

4 votes

Prove: $\lim\limits_{(x,y)\to (0,0)}\frac{xy}{(x^2+y^2)^\frac12}=0$

answered May 11, 2014 at 10:09

4 votes

Proof of paracompactness of CW-complexes (J. Lee, Introduction to Topological Manifolds)

answered Aug 30, 2014 at 12:35

3 votes

Accepted

$L=${$a^nb^nc^n : n \geq 0 $} CFG Recognizing

answered Sep 2, 2014 at 10:57

3 votes

Accepted

Question about quaternionic conjugation

answered May 5, 2014 at 19:58

3 votes

Accepted

Enumerations of the Rationals and a Refined Denseness Property

answered Jan 4, 2014 at 23:44

2 votes

Continuous mapping between topological spaces

answered Jan 31, 2014 at 11:08

2 votes

Accepted

How to disprove that there is an inner product on $\mathbb{R^2}$ s.t. the norm is $||(x_1,x_2)|| = |x_1|+|x_2|$?

answered Feb 22, 2014 at 8:52

2 votes

Continuity of series

answered Apr 25, 2014 at 0:14

2 votes

All subgroups of index 2

answered Feb 25, 2014 at 23:53

2 votes

Accepted

Show that a sequence of functions is not compact in $(C^1([-1,1]),\lVert\,\cdot\,\rVert_{\infty})$

answered May 6, 2014 at 22:17

2 votes

Does a solution to this functional equation exist and if so can we construct it?

answered May 15, 2014 at 12:44

2 votes

Accepted

Asymptotic behaviour of a couple of special functions (features exponentials and logarithms)

answered May 22, 2014 at 0:58

2 votes

Accepted

Given a polynomial of degree 5, get minimum and maximum without using derivatives

answered May 15, 2014 at 0:30

2 votes

Is $U+V$ equivalent to $U \cup V$?

answered May 26, 2014 at 9:38

2 votes

Example of ring $R$ with ideals $I\neq J$ such that $R/I \cong R/J$ as modules

answered Jul 25, 2014 at 16:25

1 vote

Question about normal subgroups in finite groups

answered May 26, 2014 at 9:35

1 vote

How do I prove this matrices question?

answered May 26, 2014 at 10:21

1 vote

Accepted

Prove or disprove that the derivative of $f$ is bounded

answered May 11, 2014 at 13:44

1 vote

finding a basis for kernal and image when dealing with a matrix vectorspace

answered Apr 29, 2014 at 22:56

1 vote

Accepted

Troubled by the question of showing that $f \equiv 0$

answered May 7, 2014 at 11:12

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45 Answers

Can one differentiate an infinite sum?

Limit with a big exponentiation tower

Condition for continuity of bilinear form

continuity and existence of all directional derivatives implies differentiable?

Find limit of this recursive sequence

Convergence of power towers

$L^1$-convergence implies $L^p$-convergence

Question about proof of FTA

About linear bijection between Banach spaces!

If $\kappa$ is an inaccessible cardinal then $|V_\kappa|=\kappa$

Prove: $\lim\limits_{(x,y)\to (0,0)}\frac{xy}{(x^2+y^2)^\frac12}=0$

Proof of paracompactness of CW-complexes (J. Lee, Introduction to Topological Manifolds)

$L=${$a^nb^nc^n : n \geq 0 $} CFG Recognizing

Question about quaternionic conjugation

Enumerations of the Rationals and a Refined Denseness Property

Continuous mapping between topological spaces

How to disprove that there is an inner product on $\mathbb{R^2}$ s.t. the norm is $||(x_1,x_2)|| = |x_1|+|x_2|$?

Continuity of series

All subgroups of index 2

Show that a sequence of functions is not compact in $(C^1([-1,1]),\lVert\,\cdot\,\rVert_{\infty})$

Does a solution to this functional equation exist and if so can we construct it?

Asymptotic behaviour of a couple of special functions (features exponentials and logarithms)

Given a polynomial of degree 5, get minimum and maximum without using derivatives

Is $U+V$ equivalent to $U \cup V$?

Example of ring $R$ with ideals $I\neq J$ such that $R/I \cong R/J$ as modules

Question about normal subgroups in finite groups

How do I prove this matrices question?

Prove or disprove that the derivative of $f$ is bounded

finding a basis for kernal and image when dealing with a matrix vectorspace

Troubled by the question of showing that $f \equiv 0$