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==== <math>\neg(\exists x)\neg\varphi \vdash (\forall x)\varphi</math> ====
: {{#ev:youtube|8V6u6BrqJ-M|||||start=188}}
==== <math>\vdash (\exists x)(\forall y)(B(y) \lor \neg B(x))</math> ====
: {{#ev:youtube|8V6u6BrqJ-M|||||start=460}}
===Derivabilidade de regras===

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