ueness of [T]: Prove directly that the standard matrix: A = [T] = [Tei) T(ẻ2) .…· Tên)] ...

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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3.3 #12 

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12. Revisiting The Uniqueness of [T]: Prove directly that the standard matrix:
A = [T] = [T(ei) T(e2)
…… T(ên)]
...
for T : R" → R " is unique: if B is another m × n matrix such that T) = Ax = Bx for all
* e R", then A = B = [T].
%3D
Hint: rewrite Ax = Bx into (A – B) = 0m. We must show that A – B = 0,mn. Scan the
entries of A – B from left to right, starting at the top row, working your way down.
Suppose there is a non-zero entry, and the first one you see is in row i, column j. Think
of a specific i e R" which would make (A – B)x a non-zero vector. Conclude that A – B
must be 0 m,n•
Transcribed Image Text:12. Revisiting The Uniqueness of [T]: Prove directly that the standard matrix: A = [T] = [T(ei) T(e2) …… T(ên)] ... for T : R" → R " is unique: if B is another m × n matrix such that T) = Ax = Bx for all * e R", then A = B = [T]. %3D Hint: rewrite Ax = Bx into (A – B) = 0m. We must show that A – B = 0,mn. Scan the entries of A – B from left to right, starting at the top row, working your way down. Suppose there is a non-zero entry, and the first one you see is in row i, column j. Think of a specific i e R" which would make (A – B)x a non-zero vector. Conclude that A – B must be 0 m,n•
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