
Re: Nx2N lapped orthogonal transform
Posted:
Aug 20, 2013 3:45 AM


On 19/08/2013 19:04, Nicolas Bonneel wrote: > On 8/19/2013 12:34 AM, James Dow Allen wrote: >> Let >> ( A B 0 ) >> ( 0 A B ) >> ( B 0 A ) >> be a 3Nx3N real matrix with A,B,0 each NxN and 0 an allzeros matrix. >> >> What is the necessary and sufficient condition for that matrix to be >> orthogonal, i.e. that its transpose also be its inverse? >> > > by direct computation, AB=BA=0 and A^2+B^2=Id, right?
No

