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Prove (or disprove) the validity of the following formulae in i) Natural Deduction ii) Tableau and iii) Resolution. 1. (P Q) (P Q) (to be
Prove (or disprove) the validity of the following formulae in
i) Natural Deduction
ii) Tableau and iii) Resolution.
1. (P Q) (P Q) (to be done in the tutorial, not part of grading)
2. ((AB)(AC)(BC))C
3. ((P Q)P)P
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