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== Correção de regras ==
=== <math> (\to E) \Gamma_1 \vdash \varphi \to \psi; \Gamma_2 \vdash \varphi \quad , / \quad , \Gamma_1,\Gamma_2 \vdash \psi </math> ===
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=== <math> (\to I) \Gamma_1, \varphi \vdash \psi \quad , / \quad , \Gamma \vdash \varphi\to\psi </math> ===
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