Results 311 to 320 of about 416,861 (348)

Boundary conditions and universal finite‐size scaling for the hierarchical |φ|4$|\varphi |^4$ model in dimensions 4 and higher

open access: yesCommunications on Pure and Applied Mathematics, EarlyView.
Abstract We analyse and clarify the finite‐size scaling of the weakly‐coupled hierarchical n$n$‐component |φ|4$|\varphi |^4$ model for all integers n≥1$n \ge 1$ in all dimensions d≥4$d\ge 4$, for both free and periodic boundary conditions. For d>4$d>4$, we prove that for a volume of size Rd$R^{d}$ with periodic boundary conditions the infinite‐volume ...
Emmanuel Michta   +2 more
wiley   +1 more source

A fixed point theorem

Archiv der Mathematik, 1997
We establish a fixed point theorem for a Lie group of isometries acting on a Riemannian manifold with nonnegative curvature.
openaire   +2 more sources

A generalization of Matkowski’s fixed point theorem and Istrăţescu’s fixed point theorem concerning convex contractions

, 2015
In this paper we obtain a generalization of Matkowski’s fixed point theorem and Istrăţescu’s fixed point theorem concerning convex contractions. More precisely, given a complete b-metric space (X, d) we prove that every continuous function $$ f:X ...
R. Miculescu, A. Mihail
semanticscholar   +1 more source

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