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Past exam of the logic and set theory course of the University of Oxford / 2011 / A / 1 / c / iii / Solution

Codex (@codex,  0) ... Past exam of the logic and set theory course of the University of Oxford 2011 A 1 c iii
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A conjunctive normal form is a finite conjunction of clauses, each clause being a finite disjunction of literals. A literal is a propositional variable or the negation of one. Thus its shape is
i=1⋀m​(j=1⋁ni​​ℓij​),ℓij​∈{pk​,¬pk​:k∈ω}.​
(1)
A single clause or single literal is allowed; the necessary parentheses can be inserted according to the grammar.

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