User math_for_ever

3 votes

1 answer

159 views

a dense subspace of inner product space whose codimension is 1

asked Jan 30, 2021 at 0:17

3 votes

2 answers

222 views

transitive action from $A_5$ on a set of $6$ elements

asked Apr 6, 2021 at 19:01

3 votes

2 answers

238 views

What fields $F$ have finitely generated multiplicative groups $F^{\times}$

asked May 8, 2021 at 21:20

3 votes

1 answer

186 views

Number of zeros outside the disk $\{ z : |z| \leq 2 \}$

asked May 20, 2021 at 3:19

2 votes

1 answer

64 views

Is there holomorphic function $g$ on the open disk such that $g(e^{i a}) =\sin{a}$

asked May 8, 2021 at 3:12

2 votes

2 answers

71 views

$f \in L_p(1,\infty ))$ if and only if $p \geq 2$

asked Apr 28, 2021 at 20:37

2 votes

2 answers

79 views

when a bounded set in $W^{2,p}(\Omega)$ has a strong limit point in $C(\overline{\Omega})$?

asked Jan 4, 2021 at 4:36

2 votes

2 answers

93 views

the norm of the trace as a linear functional on $\mathbb{C}^{n \times n}$

asked Mar 11, 2021 at 12:30

1 vote

2 answers

196 views

Are the conjugacy classes normal subgroups in $S_n$?

asked Feb 7, 2021 at 16:54

1 vote

1 answer

119 views

Jacobson radical of unitary subring

asked Feb 7, 2021 at 20:25

1 vote

1 answer

334 views

a convex closed set of a Banach space contains no closest point

asked Feb 19, 2021 at 19:50

1 vote

1 answer

68 views

What is the Levi-Civita connection of product of semi-Riemann manifolds

asked Dec 3, 2020 at 2:09

1 vote

1 answer

217 views

if a subset in $C([0,1])$ is bounded and equicontinuous

asked Jan 22, 2021 at 16:10

1 vote

1 answer

194 views

finding an automorphism group of the unit disc

asked Apr 20, 2021 at 14:14

1 vote

0 answers

129 views

automorphism group of the disc $\mathbb{D}-\{p,q\}$

asked Apr 22, 2021 at 17:53

1 vote

1 answer

104 views

a sequence being bounded implies the existence of a bounded linear operator

asked Apr 9, 2021 at 12:27

1 vote

1 answer

79 views

the boundedness of the derivative operator

asked Apr 13, 2021 at 19:11

1 vote

0 answers

76 views

intersections of powers of maximal ideal in integral domain

asked Mar 3, 2021 at 1:43

1 vote

0 answers

23 views

image of identity under nonzero continuous linear functional

asked Mar 10, 2021 at 3:55

1 vote

0 answers

100 views

a closed, convex nonempty subset of a Banach space

asked Mar 10, 2021 at 20:11

1 vote

0 answers

84 views

sequence of polynomials satisfying certain conditions

asked Mar 24, 2021 at 22:26

1 vote

1 answer

32 views

image of positive real number under field isomorphism

asked Mar 25, 2021 at 1:09

1 vote

0 answers

96 views

different versions of Runge's theorem

asked Mar 30, 2021 at 14:07

1 vote

2 answers

225 views

showing the power series $\sum_{n=1}^{\infty} \frac{z^n}{n^2}$ is holomorphic in the open unit disk but not closed

asked May 7, 2021 at 2:57

1 vote

1 answer

96 views

Splitting field over the field of fractions $\mathbb{Z}_p(x)$

asked May 9, 2021 at 2:23

1 vote

0 answers

75 views

characterizations of singular measures

asked May 19, 2021 at 2:13

1 vote

2 answers

73 views

$\lim_{t \rightarrow 0} \frac{1}{2t} \int_{b-t}^{b+t} |f- \frac{1}{2t} \int_{b-t}^{b+t} f| = 0$

asked May 1, 2021 at 23:35

1 vote

1 answer

68 views

characterization of positive measure

asked May 2, 2021 at 5:17

0 votes

0 answers

222 views

Is the set of integers locally compact

asked May 2, 2021 at 23:10

0 votes

1 answer

53 views

convergence in measure imples integrability

asked May 3, 2021 at 20:50

Stack Exchange Network

55 Questions

a dense subspace of inner product space whose codimension is 1

transitive action from $A_5$ on a set of $6$ elements

What fields $F$ have finitely generated multiplicative groups $F^{\times}$

Number of zeros outside the disk $\{ z : |z| \leq 2 \}$

Is there holomorphic function $g$ on the open disk such that $g(e^{i a}) =\sin{a}$

$f \in L_p(1,\infty ))$ if and only if $p \geq 2$

when a bounded set in $W^{2,p}(\Omega)$ has a strong limit point in $C(\overline{\Omega})$?

the norm of the trace as a linear functional on $\mathbb{C}^{n \times n}$

Are the conjugacy classes normal subgroups in $S_n$?

Jacobson radical of unitary subring

a convex closed set of a Banach space contains no closest point

What is the Levi-Civita connection of product of semi-Riemann manifolds

if a subset in $C([0,1])$ is bounded and equicontinuous

finding an automorphism group of the unit disc

automorphism group of the disc $\mathbb{D}-\{p,q\}$

a sequence being bounded implies the existence of a bounded linear operator

the boundedness of the derivative operator

intersections of powers of maximal ideal in integral domain

image of identity under nonzero continuous linear functional

a closed, convex nonempty subset of a Banach space

sequence of polynomials satisfying certain conditions

image of positive real number under field isomorphism

different versions of Runge's theorem

showing the power series $\sum_{n=1}^{\infty} \frac{z^n}{n^2}$ is holomorphic in the open unit disk but not closed

Splitting field over the field of fractions $\mathbb{Z}_p(x)$

characterizations of singular measures

$\lim_{t \rightarrow 0} \frac{1}{2t} \int_{b-t}^{b+t} |f- \frac{1}{2t} \int_{b-t}^{b+t} f| = 0$

characterization of positive measure

Is the set of integers locally compact

convergence in measure imples integrability