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Topic: Is (t^2-9)/(t-3) defined at t=3?
Replies: 166   Last Post: Oct 30, 2013 9:41 AM

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Peter Percival

Posts: 1,266
Registered: 10/25/10
Re: Is (t^2-9)/(t-3) defined at t=3?
Posted: Oct 6, 2013 4:42 PM
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Arturo Magidin wrote:

>
> Technically, two functions are equal if and only if they have the
> same domain, and they take the same value at each point on the
> domain.


I wonder why you don't require the codomains to be the same as well.
Two functions might be equal according to that definition but one could
be invertible and the other not.

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9/28/13
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10/19/13
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10/20/13
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