I'm reading this book: Functions of Several Variables and I didn't understand why this function is linear:
I think the authors made a mistake.
2026-04-13 06:16:49.1776061009
Why is $y=f(a)+f'(a)(x-a)$ linear?
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I think the author meant "the affine function $y=f(a)+f'(a)(x-a)$" instead of "the linear function". Please have a look at this.