A square matrix U E CNN is unitary if UTU = UU = I, where I is the NX N identity matrix. Prove that a square matrix is unitary if and only if the rows and columns of U form an orthonormal basis for CN.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter7: Distance And Approximation
Section7.1: Inner Product Spaces
Problem 16AEXP
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A square matrix U E CNN is unitary if UTU = UU = I, where I is the NX N identity matrix.
Prove that a square matrix is unitary if and only if the rows and columns of U form an orthonormal basis for CN.
Transcribed Image Text:A square matrix U E CNN is unitary if UTU = UU = I, where I is the NX N identity matrix. Prove that a square matrix is unitary if and only if the rows and columns of U form an orthonormal basis for CN.
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