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Exercícios de Dedução Natural
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→Raciocínio por redução ao absurdo: \Gamma_1, \neg\varphi\vdash\neg\psi; \Gamma_2, \neg\varphi\vdash\psi \, / \, \Gamma_1, \Gamma_2 \vdash \varphi
====Raciocínio por redução ao absurdo: <math>\Gamma_1, \neg\varphi\vdash\neg\psi; \Gamma_2, \neg\varphi\vdash\psi \, / \, \Gamma_1, \Gamma_2 \vdash \varphi</math>====
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==Para reflexão==
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