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In: Advanced Math

If V = U ⊕ U⟂ and V = W ⊕ W⟂, and if S1: U...

If V = U ⊕ U and V = W ⊕ W, and if S1: U → W and S2: U → W are isometries, then the linear operator defined for u1 ∈ U and u2 ∈ U by the formula S(u1 + u2) = S1u1 + S2u2 is a well-defined linear isometry. Prove this.

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