# Linear algebra problem

## Homework Statement

let:
Trace(A) = Ʃ(i=1..n) (ei|A|ei)

Show that trace is independent of the orthonormal basis chosen.

linear algebra

## The Attempt at a Solution

trace is related to the eigenvalues, which are constant?

Dick
Homework Helper

## Homework Statement

let:
Trace(A) = Ʃ(i=1..n) (ei|A|ei)

Show that trace is independent of the orthonormal basis chosen.

linear algebra

## The Attempt at a Solution

trace is related to the eigenvalues, which are constant?
IF A a diagonalizable and IF the ei happen to be eigenvectors, then sure, it's easy to see the trace is the sum of the eigenvalues. But how does that help you show it's basis independent? How do you write the relation between A and A written in a different basis?