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--><p>{{#ev:youtube|moh07B8dv2k|||||start=637}}</p>
#<math>\alpha \to (\beta \to \gamma) \vdash \beta \to (\alpha \to \gamma)</math><!--
--><p>{{#ev:youtube|mlEYLd56pMg|||||start=579}}</p>
#<math>\vdash \alpha \to (\beta \to \alpha)</math><!--
--><p>{{#ev:youtube|mlEYLd56pMg|||||start=768}}</p>
#<math>\vdash \alpha \to \alpha</math><!--
--><p>{{#ev:youtube|mlEYLd56pMg|||||start=888}}</p>
#<math>\alpha \to \beta \vdash \alpha \to (\alpha \to \beta)</math><!--
--><p>{{#ev:youtube|mlEYLd56pMg|||||start=965}}</p>
#<math>\alpha \to (\alpha \to \beta) \vdash \alpha \to \beta</math><!--
--><p>{{#ev:youtube|mlEYLd56pMg|||||start=1015}}</p>
#<math>\gamma \to \alpha, \gamma \to \beta \vdash \gamma \to (\alpha \land \beta)</math><!--
--><p>{{#ev:youtube|mlEYLd56pMg|||||start=1098}}</p>
==Dedução Natural para a Lógica Proposicional Clássica==

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