Syllogistic fallacies. Using canons to test syllogisms for validity or invalidity. Canons. Another word for ‘ rule ’ (Gk. κανων, “ rule”; OED 2b), but to be distinguished from ‘ rules ’ of inference, etc. that you’ll learn about in PHIL 305.
Using canons to test syllogisms for validity or invalidity
Distribution, cont’d.**Each method of distribution can be demonstrated by Venn diagrammingNote that, conveniently, each type of distribution is a “mirror image” of it’s contradictory statement.
*Howard-Snyder Logic: These canons are not in the HSL order, the reason for which will become apparent in the next slide.
Looks like Roman numeral I, pretty much.
Looks like Roman numeral II, sort of—maybe written by a Roman calligrapher.
Looks like Roman numeral III, sort of—particularly if you squint.
Looks like Roman numeral IV, sort of—although the likeness is really very good in this case.
Looks like Roman numeral V, sort of—especially if we were carving it in marble, in which case a “u” would be a “v.”
A couple of really stupid, demonic “tools” (i.e., demonic devices)