Then F (e)=d, thus, (d, e) and (e, d) are points on the curve y = F (x) If e = d then F (d)=d which is a contradiction If e \ne d then (d, e) and (e, d) lie on different sides of y = x thus continuity of F implies that F must cross the line y = xEquivalence Relations and Functions Week 1314 1 Equivalence Relation A relation on a set X is a subset of the Cartesian product X£XWhenever (x;y) 2 R we write xRy, and say that x is related to y by RFor (x;y) 62R,we write x6Ry Deflnition 1 A relation R on a set X is said to be an equivalence relation ifThe function f is onto if there x ∈ A such that f (x) = y ∴ f is onto Since f is one=one and onto then, the given function is bijective
Let F Be A Function Defined By F X X 1 2 1 Xge1 Statement 1 The Set X F X F 1 X 1 2 Statement 2 F Is A Bijection And F 1 X 1 Sqrt X 1 Xge1
