2 Answered Questions for the topic Tautology

Please help with this question!!!

Show that the compound propositions   is a tautology using propositional laws.

11/23/15

if R is a tautological consequence of P1, . . . ,Pn,P and also a tautological consequence of P1, . . . ,Pn,Q,

  then R is a tautological consequence of P1, . . . ,Pn,P∨Q. Explain this please..i don't understand       How could you use the result established above to give a careful justification for... more

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