Mathematics, 18.07.2019 22:10 21megoplin
Suppose we were to test the following argument to determine whether or not it is deductively valid (a case of semantic entailment): \neg \neg p, \neg \neg q\rightarrow r\models \neg (p\vee r) ¬¬p,¬¬q→r⊨¬(p∨r)¬¬p,¬¬q→r⊨¬(p∨r). the first step of using the truth-tree test is to setup the tree into what is called the ``stack''. which one of the following formulas would not be in the initial stack:
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