User windircurse

69 votes

7 answers

11k views

$100$-th derivative of the function $f(x)=e^{x}\cos(x)$

asked Apr 21, 2016 at 8:39

12 votes

6 answers

2k views

Cardinality of set of all everywhere-discontinuous functions

asked Nov 13, 2017 at 22:29

11 votes

6 answers

2k views

How many uncountable subsets of power set of integers are there?

asked Nov 22, 2017 at 17:09

6 votes

1 answer

1k views

Proof of Möbius inversion formula - the other direction

asked Jan 27, 2019 at 10:39

4 votes

4 answers

443 views

$X'$ finite-dimensional implies $X$ finite-dimensional

asked Jan 31, 2019 at 20:38

4 votes

1 answer

148 views

The biggest possible degree of a polynomial given a condition

asked May 16, 2016 at 21:00

3 votes

1 answer

730 views

Intersection of a sphere and a surface

asked Jan 28, 2017 at 16:01

3 votes

1 answer

2k views

Finding the inverse of linear transformation using matrix

asked Apr 16, 2016 at 8:40

2 votes

2 answers

75 views

Taylor series of a certain function

asked Apr 30, 2018 at 17:49

2 votes

1 answer

1k views

A question regarding normal subgroup of group of upper-triangular matrices

asked Nov 21, 2017 at 20:58

1 vote

1 answer

38 views

Question concerning the global extrema of a function on a certain set

asked Feb 11, 2018 at 17:52

1 vote

1 answer

79 views

A question regarding an equilateral triangle

asked Apr 27, 2018 at 13:15

1 vote

0 answers

271 views

Question concerning two circles that don't intersect and circles that touch them

asked Jun 23, 2018 at 14:30

1 vote

1 answer

1k views

Hamiltonian path on chessboard

asked Feb 1, 2017 at 17:59

1 vote

3 answers

2k views

Prove there are infinitely many $k$-dimensional subspaces of a finite-dimensional vector space

asked Nov 22, 2016 at 16:06

1 vote

2 answers

127 views

Example of function that is not differentiable at certain point

asked Jan 21, 2017 at 15:58

1 vote

2 answers

98 views

Volume of a body bounded by various functions

asked Jun 10, 2017 at 18:59

1 vote

1 answer

299 views

A question regarding a bounded function and convergence of an integral

asked Jun 25, 2017 at 11:53

1 vote

2 answers

99 views

Compute $\sum\limits_{n\ge1}\frac{1}{n3^n}$

asked Aug 29, 2017 at 11:04

1 vote

2 answers

95 views

Congruence equation with polynomials

asked May 1, 2017 at 15:44

1 vote

2 answers

75 views

Volume of the revolution solid

asked May 2, 2017 at 21:13

1 vote

1 answer

110 views

A question on transitive closure of a certain relation

asked Nov 6, 2017 at 10:32

0 votes

1 answer

471 views

Symmetricity of composition of equivalence relations

asked Nov 6, 2017 at 14:59

0 votes

1 answer

294 views

Flux of a vector field $F(x,y,z)=(y,x,z)$

asked Jun 10, 2017 at 13:05

0 votes

1 answer

166 views

A tough looking improper integral

asked Aug 29, 2017 at 12:12

0 votes

2 answers

260 views

Spanning subgraphs of complete bipartite graph

asked Feb 2, 2017 at 13:49

0 votes

1 answer

260 views

Unitary operator [duplicate]

asked Jun 15, 2016 at 17:29

0 votes

2 answers

88 views

Convergence of an integral involving tan function

asked Jun 17, 2016 at 13:56

0 votes

1 answer

312 views

Determining whether the function is Lipschitz continuous

asked Nov 11, 2018 at 16:48

0 votes

1 answer

207 views

Finding operator norm of functional

asked Nov 13, 2018 at 17:53

Stack Exchange Network

42 Questions

$100$-th derivative of the function $f(x)=e^{x}\cos(x)$

Cardinality of set of all everywhere-discontinuous functions

How many uncountable subsets of power set of integers are there?

Proof of Möbius inversion formula - the other direction

$X'$ finite-dimensional implies $X$ finite-dimensional

The biggest possible degree of a polynomial given a condition

Intersection of a sphere and a surface

Finding the inverse of linear transformation using matrix

Taylor series of a certain function

A question regarding normal subgroup of group of upper-triangular matrices

Question concerning the global extrema of a function on a certain set

A question regarding an equilateral triangle

Question concerning two circles that don't intersect and circles that touch them

Hamiltonian path on chessboard

Prove there are infinitely many $k$-dimensional subspaces of a finite-dimensional vector space

Example of function that is not differentiable at certain point

Volume of a body bounded by various functions

A question regarding a bounded function and convergence of an integral

Compute $\sum\limits_{n\ge1}\frac{1}{n3^n}$

Congruence equation with polynomials

Volume of the revolution solid

A question on transitive closure of a certain relation

Symmetricity of composition of equivalence relations

Flux of a vector field $F(x,y,z)=(y,x,z)$

A tough looking improper integral

Spanning subgraphs of complete bipartite graph

Unitary operator [duplicate]

Convergence of an integral involving tan function

Determining whether the function is Lipschitz continuous

Finding operator norm of functional