2nd October 2019

oswego
15

What is a propositional argument?

Logic is a formal method which provides a way to rigorously test arguments for validity. Propositional logic is formulated out of propositions (what we have before now called claims) and "connectives." Connectives are ways of putting propositions together to make new propositions.

What is the propositional form?

(c) “ ¬ p” is the proposition “not p”. A propositional form is an expression involving logical variables and con- nectives such that, if all the variables are replaced by propositions then the form becomes a proposition. Example 4 p ∧ (q ∨ r) is a propositional form with variables p, q and r.
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