Frankly I don't know how to say this,I need some help In Differential Calculus.(adsbygoogle = window.adsbygoogle || []).push({});

I'm talking about Banach space and those stuff,If it's possible if someone know a link to some online textbook,i need something that goes deep into every theorm of this branch of math.

thx you already , you don't know how much you would be helping.

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# Differential Calculus

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