منابع مشابه
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The Shannon capacity of every induced subgraph of a perfect graph equals its clique number. However, for the co{normal powers of an odd cycle the super{multiplicativity of the clique number makes the determination of capacity one of the hardest problems in combinatorics. We study the asymptotic growth of induced subgraphs of some particular type in powers of a xed graph. In case of a simple gra...
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In this paper, we introduce a class of $J$-quasipolar rings. Let $R$ be a ring with identity. An element $a$ of a ring $R$ is called {it weakly $J$-quasipolar} if there exists $p^2 = pin comm^2(a)$ such that $a + p$ or $a-p$ are contained in $J(R)$ and the ring $R$ is called {it weakly $J$-quasipolar} if every element of $R$ is weakly $J$-quasipolar. We give many characterizations and investiga...
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1. THE PROBLEM On a square lattice (we consider here a D=2+1 lattice for simplicity) the exact rotational symmetry is confined to rotations that are integer multiples of π/2. If we attempt to build operators of spin J from basic components that are identical – that is, related by a lattice symmetry – then there is an ambiguity: exp(iJθ) ≡ exp(iJ ′ θ) ∀θ = nπ 2 (1) if J ′ = J + 4N ∀N (2) Thus, f...
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Introduction: The use of ossicular graft material in ossicular chain reconstruction has significantly improved hearing results hearing after tympanoplasty and tympanomastoid surgery for chronic otitis media. Today, otologists have a wide array of tools from which to choose, but may find it difficult to know which middle ear implant works best. Materials and Methods: A prospective study of 80 ...
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ژورنال
عنوان ژورنال: Revista Brasileira de Ensino de Física
سال: 2016
ISSN: 1806-1117
DOI: 10.1590/1806-9126-rbef-2016-0099