Under what condition are Boolean filters positive implicative filters?
One of our results gives an answer to the problem, that is, we need no more conditions. Moreover, we give simple characterizations of those filters by an identity form ∀ x, y(t(x, y) ∈ F), where t(x, y) is a term containing x, y.
Keywords(Positive) implicative filter Boolean filter Fantastic filter BL algebra
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