Initial check in.

2017-04-22 15:35:18 -04:00
commit 9c88f730d5
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+05/01/99 - Added "backup" pseudo-rule to allow for correcting mistakes.
+         - Wrote simple lexer to avoid having to use flex.  This one
+           uses C++ input streams much more cleanly.
+         - Prettified some of the .h and .cc files with comments.
+8/14/99, 11:02 PM -- Trying to add support for "hidden" axioms.  Problem: Proof:applyRule does not properly apply axioms (add to lhs).