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math_for_ever
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3 votes
1 answer
164 views

a dense subspace of inner product space whose codimension is 1

3 votes
2 answers
237 views

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

3 votes
2 answers
299 views

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

3 votes
1 answer
189 views

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

2 votes
1 answer
66 views

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

2 votes
2 answers
73 views

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

2 votes
2 answers
80 views

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

2 votes
2 answers
98 views

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

1 vote
2 answers
201 views

Are the conjugacy classes normal subgroups in $S_n$?

1 vote
1 answer
122 views

Jacobson radical of unitary subring

1 vote
1 answer
412 views

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

1 vote
1 answer
76 views

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

1 vote
1 answer
228 views

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

1 vote
1 answer
221 views

finding an automorphism group of the unit disc

1 vote
0 answers
146 views

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

1 vote
1 answer
117 views

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

1 vote
1 answer
86 views

the boundedness of the derivative operator

1 vote
0 answers
89 views

intersections of powers of maximal ideal in integral domain

1 vote
0 answers
24 views

image of identity under nonzero continuous linear functional

1 vote
0 answers
106 views

a closed, convex nonempty subset of a Banach space

1 vote
0 answers
88 views

sequence of polynomials satisfying certain conditions

1 vote
1 answer
34 views

image of positive real number under field isomorphism

1 vote
0 answers
99 views

different versions of Runge's theorem

1 vote
2 answers
232 views

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

1 vote
1 answer
102 views

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

1 vote
0 answers
84 views

characterizations of singular measures

1 vote
2 answers
74 views

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

1 vote
1 answer
84 views

characterization of positive measure

0 votes
0 answers
234 views

Is the set of integers locally compact

0 votes
1 answer
55 views

convergence in measure imples integrability