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  • Member for 6 years, 8 months
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6 votes
1 answer
226 views

Operator norm on Lebesgue integrable functions

5 votes
2 answers
1k views

Every $\mathbb{Z}/6\mathbb{Z}$-module is projective

5 votes
1 answer
2k views

Group of order $255$ is cyclic [duplicate]

4 votes
1 answer
575 views

Using subspaces of $C[0,1]$ to show that Riesz's lemma is not true for $r=1$

4 votes
1 answer
1k views

Compact operators and weak convergence

3 votes
1 answer
77 views

Uniqueness of Hahn-Banach extension

3 votes
1 answer
340 views

Fraction field and ring of integers

3 votes
0 answers
223 views

There are no non-constant morphisms from $\mathbb{A}^1$ to a cubic curve

3 votes
2 answers
182 views

$K$-rational points on an elliptic curve

3 votes
1 answer
74 views

Čech cohomology of $\mathbb{P}^2_k \setminus [1:0:0]$

3 votes
1 answer
239 views

Maximal tamely ramified extension of $\mathbb{Q}_p$

3 votes
1 answer
172 views

Prove a polynomial is irreducible

2 votes
0 answers
201 views

Immersion of schemes is a monomorphism

2 votes
1 answer
42 views

Hensel's Lemma in $\mathbb{C} (\!( s )\!)$

2 votes
0 answers
398 views

Tensor product of quasi-coherent $\mathcal{O}_X$-modules on a ringed space

2 votes
1 answer
127 views

Brauer group of a field and norms

2 votes
0 answers
48 views

Elliptic curves over $\mathbb{Q}(\sqrt{2})$ and maps between them

2 votes
1 answer
406 views

Projection of Veronese embedding

2 votes
1 answer
276 views

Pell's equation and Dirichlet's unit theorem

2 votes
1 answer
137 views

Differentation under the integral sign

2 votes
1 answer
71 views

Modules and homomorphism on a domain

2 votes
1 answer
114 views

Compactness in weak$^*$-topology on $l_1(\mathbb{N})$

2 votes
0 answers
130 views

Infinite dimensional Banach spaces and sequences

1 vote
0 answers
74 views

Essential supremum of $n \sin (n^2x)$

1 vote
1 answer
572 views

Rational $3$-torsion points of an elliptic curve.

1 vote
1 answer
164 views

Self normalizing maximal subgroup of a non solvable group

1 vote
1 answer
457 views

Integral ring homomorphism implies induced map on spectra is closed

1 vote
0 answers
151 views

Spreading out a morphism of the generic fibers

1 vote
1 answer
103 views

Proving an extension is Galois

1 vote
1 answer
307 views

Constant morphism from $\mathbb{P}^m_k$ to $\mathbb{P}^n_k$ as schemes [duplicate]