Let T : ℝn→ ℝn be an invertible linear transformation, and let S and U be functions from ℝn into ℝn such that
Show that
This will show that T has a unique inverse, as asserted in Theorem 9. [Hint: Given any vin ℝn, we can write v = T (x) for some x. Why? Compute S (v) and U (v).]
Theorem 9:
Let T : ℝn→ ℝn be a linear transformation and let A be the standard matrix for T . Then T is invertible if and only if A is an invertible matrix. In that case, the linear transformation S given by S (x) = A–1 is the unique function satisfying equations (1) and (2).
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