### 2.31.15 Determinant of a matrix in ℤ/pℤ : `det`

`det` takes as argument a matrix A with coefficients in Z/pZ.
`det` returns the determinant of this matrix A.
Computation are done in ℤ/pℤ by Gauss reduction. Input :

`det([[1,2,9]%13,[3,10,0]%13,[3,11,1]%13])`

Or :

`det([[1,2,9],[3,10,0],[3,11,1]]%13)`

Output :

`5%13`

hence, in ℤ/13ℤ, the determinant of A=[[1,2,9],[3,10,0],[3,11,1]] is `5%13` (in ℤ, `det(A)=31`).