منابع مشابه
De Morgan Triples Revisited
In this paper we overview basic known results about the varieties generated by De Morgan triples and about the problem to find equations defining the variety generated by a concrete De Morgan triple. We also provide some alternative proofs and some new results, specially for the case of Łukasiewicz De Morgan triples.
متن کاملShrinkage of de~Morgan formulae under restriction
It is shown that a random restriction leaving only a fraction " of the input variables unassigned reduces the expected de Morgan formula size of the induced function by a factor of O(" 5? p 3 2) = O("
متن کاملDually quasi-De Morgan Stone semi-Heyting algebras II. Regularity
This paper is the second of a two part series. In this Part, we prove, using the description of simples obtained in Part I, that the variety $mathbf{RDQDStSH_1}$ of regular dually quasi-De Morgan Stone semi-Heyting algebras of level 1 is the join of the variety generated by the twenty 3-element $mathbf{RDQDStSH_1}$-chains and the variety of dually quasi-De Morgan Boolean semi-Heyting algebras--...
متن کاملA Characterization of De Morgan Algebras
In this note we show that every de Morgan algebra is isomorphic to a two-subset algebra, 〈P,⊔,⊓,∼, 0P , 1P 〉, where P is a set of pairs (X,Y ) of subsets of a set I, (X,Y )⊔(X , Y ) = (X∩X , Y ∪Y ), (X,Y )⊓(X , Y ) = (X ∪ X , Y ∩ Y ), ∼ (X,Y ) = (Y,X), 1P = (∅, I), and 0P = (I, ∅). This characterization generalizes a previous result that applied only to a special type of de Morgan algebras call...
متن کاملOutbreak of Campbell de Morgan spots.
An outbreak of small angiomatous lesions with the same clinical and histological features as Campbell de Morgan spots in adults is described. No infective agent was discovered, but their number was found to increase as the ambient temperature rose.
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ژورنال
عنوان ژورنال: Nature
سال: 1883
ISSN: 0028-0836,1476-4687
DOI: 10.1038/027217a0