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=== <math> (\forall x{:}P)\varphi </math> ◁▷ <math> \neg(\exists x{:}P) \neg\varphi </math> ===
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=== <math> (\forall x)\varphi \to (\forall x)\psi </math> ▶ <math>_{Sem} (\forall x)(\varphi \to \psi) </math> ===
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