cases.sty version 3.1 2020/03/10 Copyright 1993, 1994, 1995, 2000, 2002, 2020 by Donald Arseneau, asnd@triumf.ca, Vancouver, Canada. These macros may be freely transmitted, reproduced, or modified provided that this notice is left intact. Sub-equation numbering is based on subeqn.sty by Stephen Gildea; parts are based on LaTeX's eqnarray by Leslie Lamport and the LaTeX3 team; and some on amsmath.sty by the American Mathematical Society. This package provides a LaTeX environment "numcases" to produce multi-case equations with a separate equation number for each case. There is also a "subnumcases" environment which numbers each case with the overall equation number plus a letter [8a, 8b, etc.].