According to (11.41), x (x) = 0. On the other hand, by Leibniz' rule, (x (x))'

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According to (11.41), x δ(x) = 0. On the other hand, by Leibniz' rule, (x δ (x))' = δ(x) + x δ'(x) is apparently not zero. Can you explain this paradox?
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Applied Linear Algebra

ISBN: 978-0131473829

1st edition

Authors: Peter J. Olver, Cheri Shakiban

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