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PseudoNeo
  • Member for 12 years, 3 months
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57 votes
2 answers
4k views

Axiom of choice and automorphisms of vector spaces

19 votes
4 answers
734 views

Manageable project to learn some arithmetic geometry

16 votes
3 answers
1k views

Binary tetrahedral group and $\rm{SL}_2(\mathbb F_3)$

13 votes
2 answers
3k views

Is the quotient map a homotopy equivalence?

13 votes
1 answer
515 views

The Wronskian of holomorphic differentials as a q-differential

11 votes
3 answers
1k views

Differentiable at a point

11 votes
1 answer
171 views

Diffeomorphism-invariant spaces of smooth functions

11 votes
0 answers
424 views

How do I know if an irreducible representation is a permutation representation?

8 votes
2 answers
195 views

Syndeticity- and thickness-preserving bijections of $\mathbb N$

7 votes
1 answer
318 views

How many coefficients do you have to change to lower the rank of a matrix?

7 votes
1 answer
2k views

Irreducibility of $X^n - 2$ over $\mathbf Z[i]$.

6 votes
1 answer
335 views

Minimal example of Simpson's paradox

5 votes
1 answer
323 views

Center of the unit group $R^\times$ of a ring.

5 votes
1 answer
1k views

Ring of analytic functions on the circle

5 votes
1 answer
470 views

Is the intersection of two f.g. projective submodules f.g.?

5 votes
0 answers
195 views

Weighted polynomial approximation on the half-line

5 votes
1 answer
980 views

Easy proof of a weak form of Mertens's second theorem

5 votes
0 answers
186 views

What does it take to have a precise definition of volume?

4 votes
2 answers
190 views

Connectedness arguments in elementary mathematics?

3 votes
1 answer
912 views

Matrices: injectivity and determinant

3 votes
1 answer
608 views

Is the kernel of a linear form $f : A^n \to A$ a projective module?

2 votes
0 answers
62 views

Weird analogy between quadratic forms and formal systems