This is a very basic question, but I am not understanding the concept here.(adsbygoogle = window.adsbygoogle || []).push({});

it asks, consider the linear transformation:

y_1(y subscript 1) = x_2 - x_3

y_2 = x_1*x_3

y_3 = x_1 - x_2

Can anyone explain why this is not linear? I am not sure what the criteria is and the book doesn't have any example like this reasoned out.

Thank you.

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# Very simple linear algebra question:

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