Consider the vector space V = C([0, 1]) of complex-valued functions that are continuous on [0, 1]. Show that for every alpha α ∈ C and f ∈ C([0,1]), we have  (a) ⟨f − αg, f − αg⟩ = ⟨f, f⟩ − 2Re(conjugate of α⟨f, g⟩) + |α|2⟨g, g⟩ ≥ 0. For g ≠ 0, set α = ⟨f, g⟩/⟨g, g⟩, which is defined since ⟨g, g⟩ = ||g||22  ≠ 0. With this value of α, prove the Cauchy-Schwartz inequality for L2: |⟨f, g⟩| ≤ ||f||L2 ||g||L2.

Elementary Linear Algebra (MindTap Course List)
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Chapter5: Inner Product Spaces
Section5.2: Inner Product Spaces
Problem 101E: Consider the vectors u=(6,2,4) and v=(1,2,0) from Example 10. Without using Theorem 5.9, show that...
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  1. Consider the vector space V = C([0, 1]) of complex-valued functions that are continuous on [0, 1]. Show that for every alpha α ∈ C and f ∈ C([0,1]), we have 

    (a) ⟨f − αg, f − αg⟩ = ⟨f, f⟩ − 2Re(conjugate of α⟨f, g⟩) + |α|2⟨g, g⟩ ≥ 0.

    For g ≠ 0, set α = ⟨f, g⟩/⟨g, g⟩, which is defined since ⟨g, g⟩ = ||g||22  ≠ 0. With this value of α, prove the Cauchy-Schwartz inequality for L2:

    |⟨f, g⟩| ≤ ||f||L2 ||g||L2.

     
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