Intuition behind determinant of a matrix with $2$ equal rows In my linear algebra course, we have just proved that if a matrix $A$ contains $2$ equal rows, then $\det(A)=0$. 
I understand how the proof works, but could somebody offer a more intuitive explanation of why this is the case?

If you subtract the two rows the new matrix you get has the same determinant and has a row with only zeros in it. If you apply Laplace's expansion with that row you get $0$
