i1 : f = random(ZZ^6, ZZ^4) o1 = | 5 4 2 5 | | 3 0 5 9 | | 3 7 9 2 | | 6 7 9 1 | | 3 1 7 5 | | 7 6 0 3 | 6 4 o1 : Matrix ZZ <--- ZZ |
i2 : M = subquotient ( f * diagonalMatrix{2,3,8,21}, f * diagonalMatrix{2*11,3*5*13,0,21*5} ) o2 = image 0 6 o2 : ZZ-module, submodule of ZZ |
i3 : factor M o3 = 0 o3 : Expression of class Sum |