Thread: orthogonal matrices help

using the definition of an orthogonal matrix prove :
P is an orthogonal matrix if and only if P^t is an orthogonal matrix.

I know P is orthogonal if we can multiply P by P^t and get the identity matrix but dont know where to go from there!!
any help appreciated!!

Originally Posted by eleahy

using the definition of an orthogonal matrix prove :
P is an orthogonal matrix if and only if P^t is an orthogonal matrix.

I know P is orthogonal if we can multiply P by P^t and get the identity matrix but dont know where to go from there!!
any help appreciated!!

Just use the fact that and so .

still not exactly sure but have stuff to work with ill figure it thanks so much