Interactive SETL by Gary Levin <[email protected]>.
Latest version: 3.0. Binaries
and source for MS-DOS
[Clarkson U. "An Introduction to ISETL Version 1.9", G.M. Levin, Dept MCS, Clarkson U].
["Learning discrete mathematics with ISETL", Nancy Baxter. Ed. Gary Levin Dubinsky. Springer-Verlag, c.1989.]