Linear Algebra and Its Applications · Problem 3.1.27
Orthogonality — Gilbert Strang
Mathematics · orthogonal-vectors-subspaces
Problem
((a)) If Ax=b has a solution and ATy=0, then y is perpendicular to \_\_\_\_.
((b)) If ATy=c has a solution and Ax=0, then x is perpendicular to \_\_\_\_.