Hello everyone,(adsbygoogle = window.adsbygoogle || []).push({});

I was looking at the proof of chain rule as posted here:

http://web.mit.edu/wwmath/calculus/differentiation/chain-proof.html"

I am having trouble understanding why delta(u) tends to 0 as delta(x) tends to 0. Can someone point out to me why that is so?

Many thanks,

Luca

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# Proof of chain rule

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