# MatrixDegreeExpression -- the class of all matrix expressions with prescribed degrees

## Description

MatrixDegreeExpression is a type of Expression representing a matrix with specified degrees of sources and targets, i.e., a general map between free modules.

 i1 : R=QQ[x,y]; i2 : MatrixDegreeExpression {applyTable({{x^2-y^2,x^3-y^3},{x^2-4*y^2,x^3+y^3}},factor),{{-2},{-3}},{{0},{0}}} o2 = {-2} | (x-y)(x+y) (x-y)(x2+xy+y2) | {-3} | (x-2y)(x+2y) (x+y)(x2-xy+y2) | o2 : Expression of class MatrixDegreeExpression i3 : value oo o3 = {-2} | x2-y2 x3-y3 | {-3} | x2-4y2 x3+y3 | 2 2 o3 : Matrix R <--- R