منابع مشابه
On the (−1)-curve conjecture of Friedman and Morgan
We will prove that every differentiably embedded sphere with selfintersection −1 in a simply connected algebraic surface with pg > 0 is homologous to an algebraic class. If the surface has a minimal model with Picard number 1 or |Kmin| contains a smooth irreducible curve of genus at least 2, and pg is even or K 2 min 6≡ 7 (mod 8), then every such sphere is homologous to a (−1)-curve, as conject...
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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--...
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Let $P$ be a complex polynomial of the form $P(z)=zdisplaystyleprod_{k=1}^{n-1}(z-z_{k})$,where $|z_k|ge 1,1le kle n-1$ then $ P^prime(z)ne 0$. If $|z|
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In [2], I. B. Turksen looked at the Booleandisjunctive normal form of a term in two variables and the Boolean-conjunctive normal form of that term. He concluded that for some cases of certain families, when these forms are interpreted in a De Morgan system by replacing the meet by a t-norm and the join by the dual t-conorm, the disjunctive normal form is contained in the conjunctive normal f...
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ژورنال
عنوان ژورنال: Acta Arithmetica
سال: 1977
ISSN: 0065-1036,1730-6264
DOI: 10.4064/aa-33-1-29-48