Ch-4.1-exam-15-revise-김강섭

1908 days ago by matrix

A=matrix(QQ, 3, 3, [1, 1, 2, 2, 3, 3, 4, 4, 5]) Ai=A.inverse() print Ai print "det(A)=", A.det() print "det(A^(-1))=", Ai.det() print 1/A.det()==Ai.det() #checking the theorem 
       
[  -1   -1    1]
[-2/3    1 -1/3]
[ 4/3    0 -1/3]
det(A)= -3
det(A^(-1))= -1/3
True
[  -1   -1    1]
[-2/3    1 -1/3]
[ 4/3    0 -1/3]
det(A)= -3
det(A^(-1))= -1/3
True