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Results for: 'proofs'
negated quantifier proofs PHIL013AB
A video on how to do proofs with negated quantifiers. Introduces two new rules, ~AO and ~EO, and discusses how to do proofs where you need to SHOW negated quantifiers (you have to do ID).
Introduction to proofs PHIL 013AB
A video on what proofs are, which explains the concept of simple derivation, and how to do proofs with one proof rule, Modus Ponens.
introduction to predicate proofs PHIL013AB
A video introducing predicate proofs and the first two predicate proof rules, AO and EI.
predicate proofs existential out PHIL013AB
A video on how to use the rule EO (existential out) in proofs in predicate logic.
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.
A video about doing proofs, introducing how to do direct derivations, and the &I and &O rules.
proofs with modus tollens and wedge out PHIL013AB
A video explaining two proof rules, modus tollens and wedge out, which can be used in proofs for PHIL013.
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.
proofs vI double negation double arrow PHIL013
A video of just over six minutes about doing proofs with four new rules: or in, double negation, and double arrow in and out.