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Nathan Portland
  • Member for 10 years, 8 months
  • Last seen more than a month ago
52 votes
Accepted

Do matrices $ AB $ and $ BA $ have the same minimal and characteristic polynomials?

20 votes

Order of product of two elements in an abelian group

6 votes
Accepted

The cardinality of the group $\mathrm{SL}(k,\mathbb{Z}/n\mathbb{Z})$

5 votes

Question about negative matrix involution

4 votes

A sufficient condition for diagonalization

3 votes
Accepted

Construct a rational matrix $A$ s.t. $A^m = I$

3 votes

Prove that the convex hull of a set is the smallest convex set containing that set

2 votes

Determine whether or not G is isomorphic to H.

1 vote

thoughts about $f(f(x))=e^x$

1 vote

If $A$ is symmetric, then the matrix exponential $e^{A}$ is positive definite

1 vote
Accepted

How to prove a linear map to be the trace function,3x

1 vote

Properties of trace $0$ matrices: similarity, invertibility, relation to commutators

0 votes

Condition for convexity

0 votes

What is the convex-hull of the set $\{ (n,\varphi(n)) : n\in \mathbb N \} \subset \mathbb R^2$