## Search Results

Results for: '*predicate logic*'

proofs vI double negation double arrow PHIL013AB

A video on proof rules for wedge in, double negation, and double arrows. NOTE: if you're using captions, there is a possibility that the software may be displaying double arrows in the captions as single arrows. I wrote [double arrow] in the capti...

conditional derivation proofs PHIL 013AB

A nine-minute video about conditional derivation, a new kind of rule. Listen closely for a special appearance from a duck. (Edited to add: the squeaking thing is actually a raccoon)

negation proof rules PHIL013AB

A video on rules for proofs with complex negations, like ~(P & Q), ~(P v Q), and ~(P -> Q).

spontaneous show proofs PHIL013AB

A video on how to do proofs where you write down SHOW statements that don't come from specific derivation rules.