This calculates the space spanned by the rows of a matrix, or, more precisely, a basis for it. This is done via calculation of the Hermite Normal Form of said matrix.
The matrix whose row space one wants to know.
Calculates row space of a matrix via its hermite normal form.
A Matrix, consisting of the basis of the space spanned by the rows, plus potentially rows of zeros, so the dimensions of this matrix are the same as of the matrix $B$.
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