Prove ph (z/w) = ph z - ph w = ph (z-w) is equal to the angle

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Prove ph (z/w) = ph z - ph w = ph (z-w) is equal to the angle between the vectors representing z and w.
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Applied Linear Algebra

ISBN: 978-0131473829

1st edition

Authors: Peter J. Olver, Cheri Shakiban

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