# Math Help - deformation of a rectangle

1. ## deformation of a rectangle

Dear all;

I have a question.

I attached a file, in the file there is a rectangle and other picture. My question is : are the two pictures topologically homeomorphic, I mean can we deform one of them to obtain the other?

Yes, those are clearly homeomorphic. You should even be able to use the equation of such a "saddle", $z= x^2- y^2$, to compute the actual continuous mapping of one into the other.