October 4, 2015

Homework Help: Function Notation

Posted by Mikal on Wednesday, April 16, 2008 at 9:44am.

Ive been shown that a function can be written like so


where X is the Domain and Y, the co-domain. Firstly, what is the co-domain? Ive tried looking it up but all I get is "the set of which y values fall in".

If that is the case, say for the function, y=1/(x-1), do I write it like this


or instead of R\{0}, just

f:R\{1}->R,f(x)=1/(x-1)?? Where R is the set of all real numbers.

And please, if the answer is both, which would be "more right"?

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