Can every proof by contradiction also be shown without contradiction? https://math.stackexchange.com/questions/243770/can-every-proof-by-contradiction-also-be-shown-without-contradiction “Much of number theory is about trying to understand the interaction between two different structures on the integers (or the natural numbers): the additive structure and the multiplicative structure.”
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Can every proof by contradiction also be shown without contradiction? https://math.stackexchange.com/questions/243770/can-every-proof-by-contradiction-also-be-shown-without-contradiction “Much of number theory is about trying to understand the interaction between two different structures on the integers (or the natural numbers): the additive structure and the multiplicative structure.”