Math 199 (Notes)

 $f\colon X \to Y$ $f^{-1}\colon Y \to X$ $f\circ g$ $f$ is one-to-one $f$ is onto $f$ is a bijection $f=g$ ${\rm id}_X$ $f(A)$ $f^{-1}(B)$ $R$ is a relation on $X$ $R$ is reflexive $R$ is symmetric $R$ is transitive $\equiv$ is an equivalence relation on $X$ $[a]$ $X/\mathord{\sim}$
 Math 199 (Fall 2005) web pages Created: 01 Sep 2005 Last modified: Nov 13, 2005 9:41:35 PM Comments to: dpvc@union.edu