Question

"the set of numbers to which a function does not apply is called domain" is it true?
I found this definition in Spivak's book. Whereas what I learned and according to wikipedia a domain is a set of numbers that can be used in a function in order to get some output so by that definition the set of numbers to which function applies is called domain. isn't?

Answer 1

This is as false as it gets: we usually do not care about the set of numbers for which a function is not defined.

Answer 2

ahhh my apology I misread it says does apply

Answer 3

In that case, then it is true.

Answer 4

please ignore my original question