Artikler, rapporter og annet (matematikk og statistikk)

Matematisk kulturhistorie : artikkelsamling

Thorvaldsen, Steinar — Wed, 31 Jul 2002 22:00:00 GMT

Thorvaldsen, Steinar

A stochastic theory for temporal fluctuations in self-organized critical systems

Rypdal, Martin — Mon, 31 Dec 2007 23:00:00 GMT

Rypdal, Martin; Rypdal, Kristoffer

Finite Larmor radius influence on MHD solitary waves

Mjølhus, Einar — Wed, 31 Dec 2008 23:00:00 GMT

Mjølhus, Einar

Vanishing of the entropy pseudonorm for certain integrable systems

Kruglikov, Boris Serafimovich — Sat, 31 Dec 2005 23:00:00 GMT

Kruglikov, Boris Serafimovich; Matveev, VS

A propagation-separation approach to estimate the autocorrelation in a time-series

Polzehl, J — Mon, 31 Dec 2007 23:00:00 GMT

Polzehl, J; Divine, Dmitry V; Godtliebsen, Fred

Bayesian modeling and significant features exploration in wavelet power spectra

Divine, Dmitry V — Sun, 31 Dec 2006 23:00:00 GMT

Divine, Dmitry V; Godtliebsen, Fred

DeltaProt : a software toolbox for comparative genomics

Thorvaldsen, Steinar — Thu, 31 Dec 2009 23:00:00 GMT

Thorvaldsen, Steinar; Flå, Tor; Willassen, Nils P

Nijenhuis tensors in pseudoholomorphic curves neighborhoods

Kruglikov, Boris — Fri, 31 Dec 1999 23:00:00 GMT

Kruglikov, Boris
In this paper we consider the normal forms of almost complex structures in a neighborhood of pseudoholomorphic curve. We define normal bundles of such curves and study the properties of linear bundle almost complex structures. We describe 1-jet of the almost complex structure along a curve in terms of its Nijenhuis tensor. For pseudoholomorphic tori we investigate the problem of pseudoholomorphic foliation of the neighborhood. We get some results on nonexistence of the tori deformation.

Symmetry approaches for reductions of PDEs, differential constraints and Lagrange-Charpit method

Kruglikov, Boris — Wed, 19 Dec 2007 23:00:00 GMT

Kruglikov, Boris
Many methods for reducing and simplifying differential equations are known. They provide various generalizations of the original symmetry approach of Sophus Lie. Plenty of relations between them have been noticed and in this note a unifying approach will be discussed. It is rather close to the differential constraint method, but we make this rigorous basing on recent advances in compatibility theory of non-linear overdetermined systems and homological methods for PDEs.
Dette er forfatternes aksepterte versjon. This is the author’s final accepted manuscript.

Strictly non-proportional geodesically equivalent metrics have htop(g) = 0

Kruglikov, Boris — Sat, 23 Oct 2004 22:00:00 GMT

Kruglikov, Boris; Matveev, Vladimir S.
If a closed manifold M possesses two Riemannian metrics which have the same unparameterized geodesics and are not strictly proportional at each point, then the topological entropy of both geodesic flows is zero. This is the main result of the paper and it has many dynamical and topological corollaries. In particular, such a manifoldM should be finitely covered by the product of a rationally elliptic manifold and a torus.
Dette er forfatternes aksepterte versjon. This is the author’s final accepted manuscript.