Now showing items 61-70 of 357
A note on the homology of signed posets
(Kluwer Academic Publishers; Springer Science+Business Media, 1996-07)
Let S be a signed poset in the sense of Reiner [4]. Fischer [2] defines the homology of S , in terms of a partial ordering P (S) associated to S , to be the homology of a certain subcomplex of the chain complex of P (S) .
Lefschetz Motives and the Tate Conjecture
(Kluwer Academic Publishers; Springer Science+Business Media, 1999-05)
A Lefschetz class on a smooth projective variety is an element of the Q-algebra generated by divisor classes. We show that it is possible to define Q-linear Tannakian categories of abelian motives using the Lefschetz classes ...
Addendum to: A bound for the fixed-point index of an area-preserving map with applications to mechanics
(Springer-Verlag, 1976-02)
On immanants of Jacobi-Trudi matrices and permutations with restricted position
(Elsevier, 1993-03)
Let [chi] be a character of the symmetric group Ln. The immanant of an n x n matrix A = [aij] with respect to [chi] is [Sigma]w [epsilon] Sn [chi](w) a1,w(1) ... an,w(n). Goulden and Jackson conjectured, and Greene ...
General Relativistic Shock Waves that Extend the Oppenheimer-Snyder Model
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 1997-07)
In earlier work we constructed a class of spherically symmetric, fluid dynamical shock waves that satisfy the Einstein equations of general relativity. These shock waves extend the celebrated Oppenheimer-Snyder result to ...
Decay of Solutions of the Wave Equation in the Kerr Geometry
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 2006-06)
We consider the Cauchy problem for the massless scalar wave equation in the Kerr geometry for smooth initial data compactly supported outside the event horizon. We prove that the solutions decay in time in L ∞ loc . The ...
Modeling and analyzing HIV transmission: the effect of contact patterns
(Elsevier, 1988-12)
A compartmental model is presented for the spread of HIV in a homosexual population divided into subgroups by degree of sexual activity. The model includes constant recruitment rates for the susceptibles in the subgroups. ...
Stability and bifurcation of steady-state solutions for predator-prey equations
(Elsevier, 1982-09)
Random walk representations of the Heisenberg model
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1991-07)
We develop random walk representations for the spin- S Heisenberg ferromagnet with nearest neighbor interactions. We show that the spin- S Heisenberg model is a diffusion with local times controlled by the spin- S Ising ...