User SvanN - Mathematics Stack Exchange

11 votes

1 answer

453 views

Is there a sense in which $\mathbb{R}$ does have 'holes'?

asked Jun 19, 2017 at 8:13

10 votes

1 answer

1k views

Splitting infinite sets into disjoint sets of equal cardinality

asked May 15, 2017 at 12:22

5 votes

1 answer

1k views

Embedding a compact manifold in $\mathbb{R}^N$

asked Dec 12, 2018 at 18:25

4 votes

1 answer

227 views

If integral of the square of derivative is zero, is the derivative identically zero?

asked Oct 6, 2017 at 14:43

4 votes

1 answer

1k views

Elements of odd order form a subgroup when the Sylow-$2$ subgroup is cyclic

asked Aug 24, 2017 at 17:52

4 votes

1 answer

418 views

The Euler characteristic of a cubic Fermat surface

asked May 6, 2020 at 11:34

3 votes

1 answer

358 views

Grassmannians and $\mathrm{GL}(n,\mathbb{R})$

asked Feb 15, 2020 at 11:44

3 votes

1 answer

150 views

Is $X+ (X^\top)^{-1}$ invertible for invertible $X$?

asked Jun 27, 2017 at 18:05

2 votes

1 answer

472 views

Euler class of tautological line bundle over $\mathbf{HP}^n$.

asked Apr 28, 2020 at 12:10

2 votes

1 answer

300 views

Fibre sequences involving $BO(2)$, $BSO(3)$ and $BSU(2)$

asked Nov 17, 2020 at 16:05

1 vote

2 answers

1k views

Error in 'proof': Lebesgue measure $> 0$ iff set contains an interval

asked Aug 28, 2017 at 9:24

1 vote

0 answers

84 views

Set-theoretic worries about functor transformation from $\text{Id}$ to $V\mapsto V^*$

asked Nov 12, 2018 at 12:43

1 vote

3 answers

338 views

Mayer-Vietoris sequence in topological K-theory

asked Sep 9, 2019 at 13:39

0 votes

1 answer

28 views

Analytically finding the solution to an equation involving tangent.

asked Jul 13, 2017 at 16:28

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14 Questions

Is there a sense in which $\mathbb{R}$ does have 'holes'?

Splitting infinite sets into disjoint sets of equal cardinality

Embedding a compact manifold in $\mathbb{R}^N$

If integral of the square of derivative is zero, is the derivative identically zero?

Elements of odd order form a subgroup when the Sylow-$2$ subgroup is cyclic

The Euler characteristic of a cubic Fermat surface

Grassmannians and $\mathrm{GL}(n,\mathbb{R})$

Is $X+ (X^\top)^{-1}$ invertible for invertible $X$?

Euler class of tautological line bundle over $\mathbf{HP}^n$.

Fibre sequences involving $BO(2)$, $BSO(3)$ and $BSU(2)$

Error in 'proof': Lebesgue measure $> 0$ iff set contains an interval

Set-theoretic worries about functor transformation from $\text{Id}$ to $V\mapsto V^*$

Mayer-Vietoris sequence in topological K-theory

Analytically finding the solution to an equation involving tangent.