Def. A compound proposition that is always true, no matter what the truth values of the (simple) propositions that occur in it, is called tautology. A compound proposition that is always false, no matter what, is called a contradiction. A proposition that is neither a tautology nor a contradiction is called a contingency. Q1) Let p be a proposition. Indicate whether the propositions are: (A) tautologies (B) contradictions or (C) contingencies. Proposition pV-p рл-р X+7 = 18 for every real number x type

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Def. A compound proposition that is always true, no matter what the truth values of the
(simple) propositions that occur in it, is called tautology. A compound proposition that is
always false, no matter what, is called a contradiction. A proposition that is neither a
tautology nor a contradiction is called a contingency.
Q1) Let p be a proposition. Indicate whether the propositions are: (A) tautologies (B)
contradictions or (C) contingencies.
Proposition
pV-p
рл-р
X+7 = 18 for every real number x
type
Transcribed Image Text:Def. A compound proposition that is always true, no matter what the truth values of the (simple) propositions that occur in it, is called tautology. A compound proposition that is always false, no matter what, is called a contradiction. A proposition that is neither a tautology nor a contradiction is called a contingency. Q1) Let p be a proposition. Indicate whether the propositions are: (A) tautologies (B) contradictions or (C) contingencies. Proposition pV-p рл-р X+7 = 18 for every real number x type
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