ABSTRACT
A mapping from a normed space V into another normed space W is called an operator. If the mapping is linear, that is, if T ( α x + β y ) = α T x + β T y , https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780203755426/d9706a82-faf3-4225-933c-afa32800295e/content/eq96.tif"/>
