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Results for: 'PHIL013'
universal derivation PHIL013AB
A video on the Universal Derivation rule for predicate proofs, a rule for doing proofs where the SHOW line begins with Ax.
predicates and constants PHIL013AB
A short video on predicate logic, introducing constants and predicate letters.
predicate proofs existential out PHIL013AB
A video on how to use the rule EO (existential out) in proofs in 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...