User AnonymousCoward - Mathematics Stack Exchange

62 votes

5 answers

9k views

Is there a definition of determinants that does not rely on how they are calculated?

asked Feb 11, 2011 at 23:54

36 votes

3 answers

12k views

When functions commute under composition

asked Nov 23, 2010 at 2:17

36 votes

3 answers

1k views

Is the complement of an injective continuous map $\mathbb{R}\to \mathbb{R}^2$ with closed image necessarily disconnected?

asked Jul 18, 2017 at 15:52

15 votes

2 answers

5k views

Prove that $(1+p)^{p^{n-1}} \equiv 1 \pmod{p^n}$ but $(1+p)^{p^{n-2}} \not\equiv 1\pmod{p^n}$, deduce $\text{ord}_{p^n}(p+1)=p^{n-1}$

asked Feb 6, 2011 at 21:56

11 votes

1 answer

1k views

Results related to The Happy Ending Problem

asked Nov 5, 2010 at 6:57

10 votes

1 answer

4k views

Uniform limit of Lebesgue integrable functions on a space of infinite measure

asked Feb 17, 2012 at 7:29

9 votes

7 answers

2k views

Can this standard calculus result be explained "intuitively"

asked Aug 20, 2010 at 23:40

7 votes

2 answers

6k views

How can I determine asymptotic growth of binomial coefficients?

asked Nov 7, 2010 at 20:09

6 votes

1 answer

718 views

Known bounds and values for Ramsey Numbers

asked Dec 12, 2010 at 6:58

6 votes

1 answer

2k views

$\mathbb{Q}(\sqrt{1-\sqrt{2}})$ is Galois over $\mathbb{Q}$

asked Nov 28, 2011 at 4:54

5 votes

1 answer

560 views

Applications Wedderburn's Little Theorem

asked Nov 30, 2011 at 20:24

5 votes

1 answer

220 views

Can someone explain this paragraph from Griffiths and Harris to me?

asked Jan 15, 2012 at 23:39

5 votes

1 answer

159 views

Realization of graded algebras with Poincaré duality

asked Jul 12, 2012 at 18:10

5 votes

2 answers

371 views

Is $\mathcal{U}(\mathfrak{g})$ semisimple (as a module over itself)? (and related examples)

asked Jan 25, 2019 at 16:36

4 votes

1 answer

704 views

Linear algebra characterization of when half-spaces' intersection is bounded.

asked Apr 25, 2018 at 16:18

4 votes

1 answer

369 views

Generalization of the Lagrange Multiplier

asked Jan 14, 2014 at 18:56

4 votes

1 answer

366 views

Notes on dga's with a look towards Rational Homotopy Theory?

asked Jan 6, 2012 at 3:18

4 votes

1 answer

1k views

1981 Putnam problem A-3 : Differentiating under a double integral?

asked Jan 3, 2011 at 21:54

3 votes

5 answers

400 views

Existence of lines not containing given points in general position

asked Oct 28, 2010 at 14:04

3 votes

2 answers

4k views

Prime powers that divide a factorial [duplicate]

asked Feb 6, 2011 at 21:40

3 votes

2 answers

241 views

Bound on the dimension of $L(D)$ for a compact Riemann Surface

asked Mar 22, 2011 at 2:39

3 votes

0 answers

254 views

Something like the weak Whitney embedding theorem for continuous maps and homotopy.

asked May 7, 2012 at 2:14

2 votes

2 answers

298 views

How to find all possible extensions of a finite group by $C_2$

asked Sep 13, 2011 at 22:31

2 votes

1 answer

250 views

Isomorphism of $\operatorname{top}f$ implies $f$ is a projective cover.

asked Feb 9, 2012 at 4:04

2 votes

1 answer

136 views

Concordant Links have Homotopy Equivalent Complements

asked Feb 18, 2013 at 8:35

2 votes

2 answers

426 views

homotopy can't extend to one point compactification.

asked Mar 22, 2013 at 1:12

2 votes

0 answers

3k views

weakly convergent sequence in $l^1$ [duplicate]

asked Apr 18, 2013 at 2:29

2 votes

1 answer

348 views

"the standard two-fold branched cover of $CP^2$"

asked Mar 3, 2014 at 3:34

2 votes

1 answer

52 views

system of non-linear differential equations

asked May 12, 2014 at 15:51

2 votes

0 answers

288 views

Describe Geometrically the action of a discrete subgroup on the complex Heisenberg Group

asked Jul 22, 2011 at 4:39

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38 Questions

Is there a definition of determinants that does not rely on how they are calculated?

When functions commute under composition

Is the complement of an injective continuous map $\mathbb{R}\to \mathbb{R}^2$ with closed image necessarily disconnected?

Prove that $(1+p)^{p^{n-1}} \equiv 1 \pmod{p^n}$ but $(1+p)^{p^{n-2}} \not\equiv 1\pmod{p^n}$, deduce $\text{ord}_{p^n}(p+1)=p^{n-1}$

Results related to The Happy Ending Problem

Uniform limit of Lebesgue integrable functions on a space of infinite measure

Can this standard calculus result be explained "intuitively"

How can I determine asymptotic growth of binomial coefficients?

Known bounds and values for Ramsey Numbers

$\mathbb{Q}(\sqrt{1-\sqrt{2}})$ is Galois over $\mathbb{Q}$

Applications Wedderburn's Little Theorem

Can someone explain this paragraph from Griffiths and Harris to me?

Realization of graded algebras with Poincaré duality

Is $\mathcal{U}(\mathfrak{g})$ semisimple (as a module over itself)? (and related examples)

Linear algebra characterization of when half-spaces' intersection is bounded.

Generalization of the Lagrange Multiplier

Notes on dga's with a look towards Rational Homotopy Theory?

1981 Putnam problem A-3 : Differentiating under a double integral?

Existence of lines not containing given points in general position

Prime powers that divide a factorial [duplicate]

Bound on the dimension of $L(D)$ for a compact Riemann Surface

Something like the weak Whitney embedding theorem for continuous maps and homotopy.

How to find all possible extensions of a finite group by $C_2$

Isomorphism of $\operatorname{top}f$ implies $f$ is a projective cover.

Concordant Links have Homotopy Equivalent Complements

homotopy can't extend to one point compactification.

weakly convergent sequence in $l^1$ [duplicate]

"the standard two-fold branched cover of $CP^2$"

system of non-linear differential equations

Describe Geometrically the action of a discrete subgroup on the complex Heisenberg Group