Compound Propositions: Is Referring to Variables Correct?

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Bashyboy
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In my discrete math textbook, they will take a compound proposition--say, p \rightarrow q--and will refer to the propositional variables as compound propositions. This does not seem correct, and input?
 
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I think it would help if you explained you're question some more and give actual

examples. I'm not clear on what you're asking.
 

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