Learning Mathematics for IIT JEE
IIT JEE - Online Books
Friday, December 19, 2008
Description of a Function
A function f:A→B can be described by giving A and f(a) for every element in A if it is a finite set.
If A is infinite, the functions are described by a formula.
For example A function f:Z→Z is given by the formula f(x) = x²+1
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