Question: functional analysis course THEOREM (1) Let f be a bounded space linear functional defined on subspace M of a real normad linear subspace X.Then (1)
functional analysis course

THEOREM (1) Let f be a bounded space linear functional defined on subspace M of a real normad linear subspace X.Then (1) there exist a bounded linear functional F defined on X which extends f. And (2) ||F||=|lf||. THEOREM (2) Let X be a normad linear space and x* is not equal to 0 belong to X .Then there exist cartesian (bounded) linear functional f: X -:=- R such that (1) ||f||=1 and (2) f(x*]= ||x*||. Reference book introductory functional analysis with application by kreyszig
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