Tutorial 15 Elementary derivations in predicate logic.

6/16/07

The Tutorial

The sentential rules of derivation carry over unchanged into Predicate Logic

Exercises to accompany Predicate Tutorial 5

Exercise 1 (of 1).

Proofs

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The sentential rules of inference are used unchanged in predicate logic.

Derive

a) Fa ∴ ∼ ∼ Fa

b) ∴ ∼ (Fb& ∼ Fb)

c) ∼ Fm& ∼ Gn∴ ∼ (Fm∨Gn)

d) (Fa&Fa)∨(Gb&Gb)∴ Fa∨Gb

e) Fb⊃(Ga⊃Hc), Fb⊃Ga ∴ Fb⊃Hc

f) Fa∨Gb, Gb⊃Hd ∴ ( ∼ Fa⊃Hd)

g) (Fa⊃Gb)&(Gb⊃Fa) ∴ Fa≡Gb

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