ABSTRACT
Q9(1) Show that an operator on I E → 3 https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429296475/bdc73243-97dc-4cf5-9624-109e4c3275b1/content/ieq0256.tif"/> is orthogonal if and only if it is invertible and its inverse is equal to its adjoint.
