Suppose T : Rn → Rn is a linear transformation. Prove that T is an isometry if and only if T(v) · T(w) = v · w. Recall that an isometry is a bijection that preserves distance

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Suppose T : Rn → Rn is a linear transformation. Prove that T is an isometry if and only if
T(v) · T(w) = v · w. Recall that an isometry is a bijection that preserves distance
Note: When proving that if T(v)·T(w) = v·w then T is an isometry, make sure you verify that T is a bijection.

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