catbox1.zip A collection of 11 programs mostly concerned with graph theory. Disk 1/2 catbox2.zip A collection of 11 programs mostly concerned with graph theory. Disk 2/2 isetl.zip Interactive math. language based on sets. isetldoc.zip Documentation for isetl.zip. isetlsrc.zip Source code for isetl.zip. jkpropc.zip Propositional Logic Program. jkxpres.zip Extended Precision Integers. truth.zip Generates truth tables. venn.zip Displays Venn diagrams. voting.zip Illustrations of four voting schemes.