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Exercícios de Dedução Natural (view source)
Revision as of 02:18, 19 September 2020
, 02:18, 19 September 2020no edit summary
==== <math>\neg\alpha\to\neg\beta \vdash \beta\to\alpha</math> ====
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==== <math>(\alpha \to \beta) \lor (\beta \to \alpha)</math>, via raciocínio por absurdo</math> ====
<!---->{{#ev:youtube|9BdeXjhyJWs|||||start=45}}
==== <math>(\alpha \to \beta) \lor (\beta \to \alpha)</math>, via terceiro excluído</math> ====
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