If not p, then not q means that if something is not true or does not happen (p), then something else is also not true or does not happen (q).
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In the statement "p implies q," the relationship between p and q is that if p is true, then q must also be true.
The statement "If not q, then not p" is logically equivalent to "If p, then q."
The statement "p if and only if q" is true when both p and q are true, or when both p and q are false.
The statement "p implies q" can be expressed as "not p or q" using the logical operator "or" and the negation of "p".
Yes, modus ponens is a valid form of deductive reasoning in logic. It involves deriving a conclusion from two premises: if p then q (p → q) and p are true, then q must also be true.