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Results for: 'proofs'

9:18

negated quantifier proofs PHIL013AB

By: mcweiner

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).

8:05

Introduction to proofs PHIL 013AB

By: mcweiner

A video on what proofs are, which explains the concept of simple derivation, and how to do proofs with one proof rule, Modus Ponens.

7:58

introduction to predicate proofs PHIL013AB

By: mcweiner

A video introducing predicate proofs and the first two predicate proof rules, AO and EI.

7:29

DD, &O, and &I proofs

By: mcweiner

A video about doing proofs, introducing how to do direct derivations, and the &I and &O rules.

7:39

spontaneous show proofs

By: mcweiner

A video about how to do proofs where you write down SHOW statements that don't come from any particular derivation rule.

7:35

spontaneous show proofs PHIL013AB

By: mcweiner

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

5:25

universal derivation PHIL013AB

By: mcweiner

A video on the Universal Derivation rule for predicate proofs, a rule for doing proofs where the SHOW line begins with Ax.

7:42

predicate proofs existential out PHIL013AB

By: mcweiner

A video on how to use the rule EO (existential out) in proofs in predicate logic.

7:29

DD, and-I, and and-O proofs

By: mcweiner

A video about three proof rules, now updated with a new file name.