When using echelon_form(M), for a square matrix M over ZZ, is there a way to recover the row operations that sage used to get the echelon form? Or, could it show me an invertible matrix that when multiplied onto M results in the echelon form? This would be similar to the way smith_form(M) displays matrices U, V such that U*M*V = D. I've checked the reference manual and pyx files but haven't found that function listed. Thanks.
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