Gapplet

Given a polynomial d in Q[X] of degree n, and a natural number m, we determine the matrix of the projection map Q[X]_<m -> Q[X]_<n with kernel dQ[X]_<n Q[X]_<m.

Input d,  e.g., X^5-3*X-1
Input m N
Compute the n×m matrix of the linear transformation   Q[X]<m -> Q[X]<m,   g -> g mod d
The n×m matrix