Let A be a matrix of order (30,30) and A=(A1, A2
A3, A4)
where A1 (24,24), A3 (6,24), A2(24,6) and A4(6,6) with
A3 is a zero matrix. We know there is unimodular transformation U such that
UA=(B1, B2
B3,B4) with B2(24,6) is a zero matrix and
B4(6,6) identity matrix. How we can find U (echelon form or other) using
Sage?
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