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Exercícios de Dedução Natural (view source)

7 bytes added , 15:07, 15 September 2020

====<math>\varphi \land \psi \vdash \psi \land \varphi</math>====

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#====<math>(\varphi \land \psi) \land \delta \vdash \varphi \land (\psi \land \delta)</math>====<!--

--><p>{{#ev:youtube|moh07B8dv2k|||||start=528&end=582&loop=1}}</p>

#<math>\varphi \vdash \varphi \land \varphi</math><!--

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