User Aaron

42 votes

1 answer

1k views

What does the space of non-diagonalizable matrices look like?

asked Jul 15, 2014 at 22:51

39 votes

2 answers

2k views

Is there a clever solution to this elementary probability/combinatorics problem?

asked Oct 8, 2011 at 1:00

29 votes

2 answers

3k views

A constrained topological sort?

asked Oct 16, 2011 at 16:39

17 votes

3 answers

4k views

When does a SES of vector bundles split?

asked Feb 26, 2014 at 21:37

14 votes

3 answers

3k views

A proof of the product rule using the single variable chain rule?

asked Aug 2, 2018 at 19:27

11 votes

1 answer

1k views

Find conjugation invariant functions without using eigenvalues?

asked Nov 2, 2011 at 3:39

11 votes

0 answers

2k views

Does finite projective resolution imply finite free resolution?

asked Jun 15, 2011 at 4:09

8 votes

2 answers

2k views

Maps between Eilenberg–MacLane spaces

asked Jun 4, 2011 at 6:40

5 votes

2 answers

459 views

Tiling arbitrarily large portions of the plane implies tiling the plane?

asked May 26, 2014 at 4:27

5 votes

2 answers

771 views

Is the intersection of finite index subfields finite?

asked May 10, 2015 at 3:22

5 votes

0 answers

100 views

When are u and 1-u never both units?

asked Jan 21, 2017 at 11:15

5 votes

2 answers

165 views

A Fibonacci identity and $f(Av)=\det(A)f(v)$

asked May 15, 2017 at 21:13

5 votes

1 answer

117 views

When does $e^{hD}$ give a well defined operator on analytic functions?

asked Aug 16, 2019 at 22:59

5 votes

0 answers

85 views

Finding the order of a 2x2 matrix mod n when n is NOT prime

asked Jul 4, 2021 at 7:13

3 votes

1 answer

266 views

Projection matrices with constant diagonal

asked Sep 7, 2021 at 22:00

3 votes

2 answers

56 views

Non-inductive solution to this probability riddle?

asked Feb 11, 2020 at 7:31

3 votes

1 answer

194 views

Pullback of representations along the Cayley embedding?

asked Jun 4, 2017 at 11:27

3 votes

1 answer

2k views

When does a real matrix have a real square root?

asked Jan 17, 2016 at 2:09

3 votes

2 answers

121 views

Conceptual approach to the formula $\sum_{i=1}^n \det(v_1, \ldots, Av_i, \ldots, v_n)=\text{tr}(A)\det(v_1, \ldots, v_n)$

asked May 8, 2015 at 3:29

3 votes

0 answers

235 views

When is a monic endomorphism epic?

asked Nov 12, 2016 at 22:24

3 votes

1 answer

800 views

What is the image of operator exponential?

asked Oct 10, 2014 at 13:43

3 votes

0 answers

800 views

Integrating angular velocity to obtain orientation

asked Nov 16, 2012 at 3:17

3 votes

1 answer

64 views

Probability that $4A+2B+C$ is a multiple of $8$ (better proof)

asked Jul 14, 2022 at 0:58

2 votes

0 answers

135 views

Determining properties of the coefficients of a Taylor series

asked Jul 30, 2017 at 13:20

2 votes

1 answer

77 views

How big can a subspace of $U\otimes V$ be if it contains no non-zero "pure" tensors?

asked Mar 28, 2021 at 8:40

2 votes

0 answers

67 views

Reconstructing paths on the sphere from the ratio of acceleration to velocity

asked Oct 2, 2012 at 0:23

2 votes

0 answers

73 views

Difficulties with the "correspondence" between essential singularities and formal Laurent series

asked Dec 26, 2014 at 15:34

1 vote

1 answer

313 views

Coordinate free proof of height of intersection of two triangles with common base

asked Oct 2, 2016 at 4:10

1 vote

1 answer

220 views

Moving tensor products inside homs

asked Feb 9, 2014 at 19:41

1 vote

0 answers

130 views

Designing a kernel function for generating functions

asked Jun 9, 2017 at 11:37

Stack Exchange Network

40 Questions

What does the space of non-diagonalizable matrices look like?

Is there a clever solution to this elementary probability/combinatorics problem?

A constrained topological sort?

When does a SES of vector bundles split?

A proof of the product rule using the single variable chain rule?

Find conjugation invariant functions without using eigenvalues?

Does finite projective resolution imply finite free resolution?

Maps between Eilenberg–MacLane spaces

Tiling arbitrarily large portions of the plane implies tiling the plane?

Is the intersection of finite index subfields finite?

When are u and 1-u never both units?

A Fibonacci identity and $f(Av)=\det(A)f(v)$

When does $e^{hD}$ give a well defined operator on analytic functions?

Finding the order of a 2x2 matrix mod n when n is NOT prime

Projection matrices with constant diagonal

Non-inductive solution to this probability riddle?

Pullback of representations along the Cayley embedding?

When does a real matrix have a real square root?

Conceptual approach to the formula $\sum_{i=1}^n \det(v_1, \ldots, Av_i, \ldots, v_n)=\text{tr}(A)\det(v_1, \ldots, v_n)$

When is a monic endomorphism epic?

What is the image of operator exponential?

Integrating angular velocity to obtain orientation

Probability that $4A+2B+C$ is a multiple of $8$ (better proof)

Determining properties of the coefficients of a Taylor series

How big can a subspace of $U\otimes V$ be if it contains no non-zero "pure" tensors?

Reconstructing paths on the sphere from the ratio of acceleration to velocity

Difficulties with the "correspondence" between essential singularities and formal Laurent series

Coordinate free proof of height of intersection of two triangles with common base

Moving tensor products inside homs

Designing a kernel function for generating functions