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Computing Hermite normal form and Smith normal form with transformation matrices

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All functions sometimes return a wrong answer even for small-size matrices with small values. For instance: For matrix [[ 1 -10 0 4 2 -3 6] [ -6 -8 -3...

bug

let H = AR, H is HNF of A, then H=(h_{ij}) should satisfy the following conditions: (1) h_{ij} = 0 (for i < j) (2) h_{ii} >= 0 (3) 0...

enhancement