The tenth workshop in Dr Joel Feinstein's G11FPM Foundations of Pure Mathematics module Worksheet on functions and countability: one-sided inverses (left inverses and right inverses), injective, surjective and bijective functions, and countability.
These videos are also available on YouTube at: https://www.youtube.com/playlist?list=PLpRE0Zu_k-BzsKBqQ-HEqD6WVLIHSNuXa
Dr Feinstein's blog may be viewed at: http://explainingmaths.wordpress.com
Dr Joel Feinstein is an Associate Professor in Pure Mathematics at the University of Nottingham.