Webster's: 1. a deductive scheme of a formal argument consisting of a
major and a minor premise and a conclusion (as 'every virtue is laudable;
kindness is a virtue; therefore, kindness is laudable') 2. a subtle,
specious, or crafty argument 3. deductive reasoning
To use Syllogism, enter a syllogism, one line at a time, and then test
conclusions or ask the program to draw a conclusion.
A syllogism as (mis)defined here is a (possibly empty) set of
numbered premises. No term may occur more than twice. Exactly two terms
must occur exactly once: these are the two 'end' terms, which will appear
in the conclusion. Furthermore, each premise must have exactly one term
in common with its successor, for some ordering of the premises.
10 Socrates is a Greek
20 all men are mortal
30 all Greeks are men
40 no gods are mortal
Syllogism will draw a conclusion from such a list, if possible, or
test a conclusion of yours. Syllogism may make you feel computers are smarter.
10 all mortals are fools
20 all Athenians are men
30 all philosophers are geniuses
40 all people with good taste are philosophers
50 Richter is a diamond broker
60 Richter is the most hedonistic person in Florida
70 all men are mortal
80 no genius is a fool
90 all diamond brokers are people with good taste
100 the most hedonistic person in Florida is a decision-theorist
Syllogism can find
the one logical conclusion
here. Can you?
Reference: H. Gensler, 'A Simplified Decision Procedure for
Categorical Syllogisms,' Notre Dame J of Formal Logic 14 (1973) 457-466
Syllogism was written by Richard Sharvy
in 1987 or so (he died in 1988).
It was written in some kind of Microsoft BASIC for CP/M. A few years later I
distributed a compiled, Microsoft QuickBasic version of that program for the
Macintosh, called 'Syllogism?'. That program is unstable on MacOS 8.x and up.
It wasn't a rock on earlier Mac systems either.
Syllogism 1.0 is closer to standard BASIC than its predecessor. It's tested stable
under two free and publicly distributed implementations of BASIC. Making the source
code compliant with two independently developed versions BASIC should yield a useful
degree of portability.
Syllogism 1.0, as source code or compiled program, costs zero dollars. You may distribute it.
You may distribute altered versions provided: 1) they work, 2) there is clear and prominent
notification that you altered the program and how, 2) there is clear and prominent notification
of the original authorship.
Crunchy Pickle Software ...Macintosh software
that puts your tastebuds first.