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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.
