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Unformatted text preview: and surjective. January 25 Functions, Page 3 7.1 Functions Let A , B , C be sets and f : A B , g : B C . Then the composition of f and g , written g f is the function g f : A C such that g f ( a ) = g ( f ( a )) , a A. The inverse of a bijection f : A B is the function f1 : B A such that f1 f is the identity function on A . The graph of a function f : A B is the set { ( a, f ( a )) : a A } . January 25 Functions, Page 4 7.2 Some special functions Ceiling and oor. Factorial. January 25 Functions, Page 5...
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 Winter '07
 YaoyunShi

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