Developer`HermiteNormalForm
HermiteNormalForm[m] gives the Hermite normal form of an integer matrix m.
The result is given in the form u, r where u is a unimodular matrix, r is an upper triangular matrix, and u . m == r. See also: RowReduce, LatticeReduce.
Further Examples
HermiteNormalForm[m] gives the Hermite normal form of an integer matrix m. 
u, r
where u is a unimodular matrix, r is an upper triangular matrix, and u . m == r. 
