Question: Write a proof which reduces the conclusion (r^y) V ((IV 2) V (-y V z)) to premises that can't be reduced further. Expressions like

Write a proof which reduces the conclusion (r^y) V ((IV 2) V (-y V z)) to premises that can't be reduced

Write a proof which reduces the conclusion (r^y) V ((IV 2) V (-y V z)) to premises that can't be reduced further. Expressions like (Ay) V ((TV2) V (-y V z)) used in the antecedents and succedents of sequents are called: tautologies when is valid (the antecedent is empty); 4 contradictions when is valid (the succedent is empty); Is (x Ay) V (-(2 V 2) V (-y V z)) a tautology, a contradiction, or neither?

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