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Math 401 - Introduction to Real Analysis
www.math.psu.eduMath 401 - Introduction to Real Analysis Topics for Midterm I - Review 1 - Bijections A map f : A → B is an injection if it is one-to-one, i.e. distinct elements a1,a2 ∈ A have distinct images f(a1) 6= f(a2).The map f is a surjection if it is onto, i.e. every element b ∈ B is