I uploaded the latest version of AI::Prolog. It's about 40% faster, incorporates math and has a workaround for the bug in older versions of Perl where undef looks like a number. Hopefully my test failures will go away.
0.62 Fri Feb 25 Added code to avoid bug in some Perl's where "undef" looks like a number. Major performance improvement. Now runs about 40% faster. Added listing. println(X). is(X,Y). plus(X,Y). minus(X,Y). mult(X,Y). div(X,Y). mod(X,Y). ge(X,Y). gt(X,Y). le(X,Y). lt(X,Y). Added towers of hanoi and a scheduler to the examples/.