The proportion of trees that are linear
نویسندگان
چکیده
منابع مشابه
on the effect of linear & non-linear texts on students comprehension and recalling
چکیده ندارد.
15 صفحه اولMULTIPLICATION MODULES THAT ARE FINITELY GENERATED
Let $R$ be a commutative ring with identity and $M$ be a unitary $R$-module. An $R$-module $M$ is called a multiplication module if for every submodule $N$ of $M$ there exists an ideal $I$ of $R$ such that $N = IM$. It is shown that over a Noetherian domain $R$ with dim$(R)leq 1$, multiplication modules are precisely cyclic or isomorphic to an invertible ideal of $R$. Moreover, we give a charac...
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Let K be the field of real or complex numbers. Let (X ∼=K2n , ω) be a symplectic vector space and take 0<k<n,N =( 2n 2k ). Let L1, . . . , LN ⊂X be 2k-dimensional linear subspaces which are in a sufficiently general position. It is shown that if F :X −→X is a linear automorphism which preserves the form ωk on all subspaces L1, . . . , LN , then F is an k -symplectomorphism (that is, F ∗ω= kω, w...
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In this chapter we show how algebraic geometry can be used to define and then analyse the properties of certain important classes of discrete probability models described through probability trees. Our aim is to show how much wider classes of discrete statistical models than have been considered previously have a useful algebraic formulation and unlike its competitors this class is closed under...
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Interval p-graphs were introduced by Brown et al. in 2002 as a generalization of interval bigraphs [D.E. Brown, S.C. Flink and J.R. Lundgren, Congr. Numer. 157 (2002), 79–93]. Little work has been done towards characterizing them. For interval bigraphs the only known forbidden subgraph characterization is for trees. As it appears to be quite difficult to find a forbidden subgraph characterizati...
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ژورنال
عنوان ژورنال: Discrete Mathematics
سال: 2020
ISSN: 0012-365X
DOI: 10.1016/j.disc.2020.112008