matrix operation

Dear Mathml users,

I need matrix operation definition
such as
matrix x matrix
vector x matrix, matrix x vector
matrix + matrix, matrix - matrix
As for vector, vectorproduct, innerproduct
outerproduct are exist. However, for matrix,
what should I use for such operation ?

Best regards,

Oka
-- 
oka <oka@bpe.es.osaka-u.ac.jp>