Let X be a normed linear space over F. It follows from Exercise 1 that X* B(X,F) is a Banach space. (X* is called the dual space of X and elements of X are called bounded linear functionals.) Prove that if {rn} is a sequence in X such that {F(rn)} is bounded for every F in X, then the sequence {rnll} is bounded.

Linear Algebra: A Modern Introduction
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ISBN:9781285463247
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Chapter6: Vector Spaces
Section6.2: Linear Independence, Basis, And Dimension
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. Let X be a normed linear space over F. It follows from Exercise 1 that X* B(X,F) is a
Banach space. (X* is called the dual space of X and elements of X* are called bounded linear
functionals.) Prove that if (rn} is a sequence in X such that {F(rn)} is bounded for every
F in X, then the sequence {|a|} is bounded.
Transcribed Image Text:. Let X be a normed linear space over F. It follows from Exercise 1 that X* B(X,F) is a Banach space. (X* is called the dual space of X and elements of X* are called bounded linear functionals.) Prove that if (rn} is a sequence in X such that {F(rn)} is bounded for every F in X, then the sequence {|a|} is bounded.
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