Dois Pontos 6 (2) (2009)

Logic does not have purely existential theorems: the only existential sentences that are valid are those with valid universal analogues. Here, we show indeed this is so, when properly interpreted: every existential validity has a simple universal analogue, which is also valid. We also characterize existential and universal validities in terms of tautologies
Keywords validades existenciais  quantificação  quantification  tautologias  existential validities  universal validities  tautologies  validades universais  Logic  Lógica
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DOI 10.5380/dp.v6i2.17336
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