Det is the inert form of det.
Det takes as argument a matrix with coefficients in ℤ/pℤ.
Det returns det without evaluation. It is used in conjunction with mod in Maple syntax mode to find the determinant of a matrix with coefficients in ℤ/pℤ.
Input in Xcas mode :
you need to eval(ans()) to get :
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).
Input in Maple mode :