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Proving a tautology using truth table
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[QUOTE="MarcL, post: 4997631, member: 360098"] [h2]Homework Statement [/h2] ((p_r)^(q_r))<-->((p^q)_r) Prove whether the following statement is a tautology , contigency or contradiction using a truth table. [h2]Homework Equations[/h2][h2]The Attempt at a Solution[/h2] I did the truth table, but this whole thing is one statement no? What do I compare? the first half of the bi conditional statement to the second? or the whole statement vs. the two halves? I don't know which to compare to decide whether or not it is a contingency.EDIT: figured out the tautology is if L.H.S of <--> is equal to RHS. Sorry for the post! [/QUOTE]
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Proving a tautology using truth table
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