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.
DD, &O, and &I proofs
A video about doing proofs, introducing how to do direct derivations, and the &I and &O rules.
spontaneous show proofs
A video about how to do proofs where you write down SHOW statements that don't come from any particular derivation rule.
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.
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.
predicate proofs existential out PHIL013AB
A video on how to use the rule EO (existential out) in proofs in predicate logic.
DD, and-I, and and-O proofs
A video about three proof rules, now updated with a new file name.