# Today I Learned

Some of the things I've learned every day since Oct 10, 2016

## 9: Unimodular Matrices

October 19, 2016

Posted by on A **unimodular matrix** is a square integer matrix with determinant .

A unimodular matrix has an inverse which is itself unimodular. Furthermore, since the identity matrix as well as the product of any 2 unimodular matrices are all unimodular, the set of unimodular matrices forms a group under multiplication, denoted .

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