... followingsubspaces:(a) span(b) span(c) span .13. Compute the norm of a vector in the factor space (seeexercise 1). Vitali Milman An Introduction To Functional Analysis WORLD 199920CHAPTER ... inand define .By uniqueness, we have the identity map:(10.32)between two Banach spaces, is one -to- one, onto and .By the Banach Theorem there exists such that . Thismeans that .10.5 Hahn-Banach ... for-mula (for any representative of an equiva-lent class . The operator is de-fined by ( ) where is the constant sequence). (A constant sequence is, of course, a Cauchysequence and .)Now, to...