IN112 Mathematical Logic
Validity of an argument can be defined: in model theory: is the conclusion true when premises are? in proof theory: does the argument respect some rules?
classical determinate truth i - University of OxfordThe validity of the argument depends on the assumption that a disjunction is true if one of its disjuncts is true, as stated by Ockham in the second quote above ... NATURAL DEDUCTION IN PROPOSITIONAL LOGIC - DiTextThese lines constitute a valid derivation of the conclusion from the premises because each line is a substitution instance of a valid argument form. These ... Chapter 2 - Arguments, Valid and Invalid - Purdue MathThe only line of the truth table in which all the premises are true is the first line, and on this line, the conclusion is also true. Therefore, the argument is.
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