Unimodular matrix

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What Wikipedia says

In mathematics, a unimodular matrix M is a square integer matrix having determinant +1 or −1. Equivalently, it is an integer matrix that is invertible over the integers: there is an integer matrix N that is its inverse (these are equivalent under Cramer's rule).

Excerpt from the Wikipedia article “Unimodular matrix”, under the CC BY-SA 4.0 license. Read the article on Wikipedia