MAT 1348 Study Guide - Final Guide: Identity Function, Binary Relation, Bijection

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Defn: the identity function on a set a, denoted by a : a a, is the function de ned as a(x) = x for all x a. Observe that a is an invertible function. (what"s its inverse?) Defn: let f : a b and g : b c be two functions. The composition g f of f and g is the function g f : a c de ned as (g f )(x) = g(f (x)) for all x a. Observe that g : b a is the inverse of f : a b if and only if g f = a and f g = b. Let f : z (z 0) q be a function de ned as f (m, n) = Let f : (0, + ) (0, + ) be a function de ned by f (x) = 2x2 + 3.

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