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罗由学 《福州大学学报(自然科学版)》1985,(2):1-16
图的联结数是图的示性数之一.D.R.Wuodall[1]首先引进了这个概念,研究了联站数与 图的其它量之间的关系.V.G.Kane,S.P.Mohanty和R.S.Hales[2]研究了一些乘积图 的联结数.[3]中证明了[2]中提出的关于bind(Cm×Cn)的猜想.本文进一步研究了[2]、[3]未 解决的若干乘积图的联结数,得到了Lm×Cn,Cm Cn,Lm Cn,Cm*Cn,Lm*Cn,Cm(Cn),Lm(Cn)等图的联结数。 相似文献
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We prove a splitting theorem for stably causal spacetimes and another splitting theorem for finitely compact spacetimes admitting a proper time synchronizable reference frame. 相似文献
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《Quaestiones Mathematicae》2013,36(2):269-279
We establish quantitative extensions of two Grothendieck's results on into isomorphisms in projective tensor products. Among others, we prove the following. Let Y be a closed subspace of a Banach space Z and let j : Y → Z denote the identity embedding. If Y is complemented in its bidual Y??, then the injection modulus of the natural inclusion Id ? j : Y??Y → Y??Z satisfies 1/λ loc (Y,Z) ≤ i(Id ? j) ≤ λ(Y,Y??)/λ(Y,Z), where λ(·,·) and λloc(·,·) are, respectively, the projection and the local projection constants. 相似文献
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Hua Qiu Weiyi Su Yin Li 《分析论及其应用》2007,23(2):147-161
In this paper, we consider the Riesz product dμ =^∞∏j=1(1+ajRexbjλj(x))dx in local fields, and we obtain the upper and lower bound of its Hausdorff dimension. 相似文献
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Let L be the infinitesimal generator of an analytic semigroup on L2 (Rn) with suitable upper bounds on its heat kernels. Assume that L has a bounded holomorphic functional calculus on L2(Rn). In this paper,we define the Littlewood- Paley g function associated with L on Rn × Rn, denoted by GL(f)(x1, x2), and decomposition, we prove that ‖SL(f)‖p ≈‖GL(f)‖p ≈‖f‖p for 1 < p <∞. 相似文献