2: Relations Last updated Mar 21, 2022 Save as PDF 1.9: Hints to get started on some exercises 2.1: Definitions Page ID99055 Bob Dumas and John E. McCarthyUniversity of Washington and Washington University in St. Louis ( \newcommand{\kernel}{\mathrm{null}\,}\) 2.1: Definitions2.2: Orderings2.3: Equivalence Relations2.4: Constructing Bijections2.5: Modular Arithmetic2.6: Exercises