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Linear representations of algebras and groups, Lie theory, associative algebras, multilinear algebra.

3 votes

Feit-Thompson theorem: the Odd order paper

The Wikipedia article Odd order theorem is worth reading.
Martin Sleziak's user avatar
0 votes

Matrix algebra as Clifford algebra

The conventional real Clifford algebras are matrix algebras over the real numbers, complex numbera, or quaternions, and are simple algebras in the sense of ring theory. Any subalgebra that is a simple …
Charles Matthews's user avatar
1 vote

trace of a matrix of finite order

You have a (real) linear representation r of the cyclic group C of order d; you give its character, and then ask for the character of a certain subrepresentation of the tensor product of r and its dua …
Charles Matthews's user avatar
13 votes
Accepted

Ado's Theorem Proof

Your argument fails because the bracket can (sometimes) take pairs of elements into the centre. Therefore the direct sum as vector spaces isn't necessarily a direct sum of Lie algebras. For nilpotent …
Charles Matthews's user avatar
2 votes

About representation theory of Heisenberg group

You should really study the representation theory in the wider context of a semidirect product. George Mackey wrote the basic theory on this, and you'll almost certainly understand more by working out …
Charles Matthews's user avatar
2 votes
Accepted

Morphisms between representations

Isn't this just a fancy way of talking about the cycle decomposition of a permutation? The language you use is a little imprecise. But, firstly, by change of basis P can be made into a block matrix fo …
Charles Matthews's user avatar
1 vote

Origin of symbol *l* for a prime different from a fixed prime?

For a mathematician $k$ would be more logical (reflection symmetry in the alphabet)? But confusing because $k$ is a field ... so take one step more. Any better explanations?
Charles Matthews's user avatar
-1 votes

Splitting the determinant polynomial into linear factors - a Dedekind problem

I don't know why you say the Dedekind problem is "forgotten": the Dedekind determinant is discussed in number theory books. The factorisation for the regular representation for general finite groups w …
Charles Matthews's user avatar
3 votes

What is a representation?

See http://en.wikipedia.org/wiki/Unitary_representation for the representation theory. You can follow the links from http://en.wikipedia.org/wiki/Simple_Lie_group#Exceptional_cases to find external li …
Charles Matthews's user avatar