Question: Prove using natural deduction: 0. (p v q) v r, s t q s 1. p (p q), p q 2. p q (p q)

Prove using natural deduction:

0. (p v q) v r, s t q s

1. p (p q), p q

2. p q (p q)

3. (p q) v (p r) p (q v r)

= conjunction, "and"

v = disjunction, "or"

= implication, "implies"

= turnstile, "is provable

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