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Constructive logic
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{{use dmy dates|date=April 2025}} '''Constructive logic''' is a family of logics where proofs must be constructive (i.e., proving something means one must build or exhibit it, not just argue it “must exist” abstractly). No “non-constructive” proofs are allowed (like the classic proof by contradiction without a witness). The main constructive logics are the following:
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