To say that "not p" holds, is the same as to say that p doesn't hold?

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I know that this seems like a silly question, but I was deducing something and after finished I tried translating it into words. I don't know why but the doubt just sruck me as i was trying to make sense of what i was writing. Could any one please answer it and justfy it? thank you

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It depends on your interpretation of "holds".

If, as is usually so, you mean "is true" as in classical logic, then "not P is true" and "P is not true" have the same meaning.

If you mean "is proven" or "is provable" as in constructive logic, then "not-P is proven" is not the same as "P is not proven".