Pag 46 says:(adsbygoogle = window.adsbygoogle || []).push({});

He begins to do a rethink about what is a function.

Function is a rule? If it is a rule then:

f(x) = x²

and

f(x) = x² +3x + 3 -3(x+1)

are different. But that was not what we wanted.

But he rewrites, this way:

f(x) = x²

and

f(x) = x² +3x +3 -c(x+1)

Apparently this was a small mistake.

I would like to hear the opinion of colleagues. Thank you.

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# Calculus Michael Spivak 3th ed. Pag 46: Function as a rule

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