We investigate function classes h#Pi f which are deened as the closure of #P under the operation f and a set of known closure properties of #P, e.g. summa-tion over an exponential range. First, we examine operations f under which #P is closed (i.e., h#Pi f = #P) in every relativization. We obtain the following complete characterization of these operations: #P is closed under f in every rela-tiv...

The existence of extra chiral generations with all fermions heavier than MZ is strongly disfavoured by the precision electroweak data. However the data are fitted nicely even by a few extra generations, if one allows neutral leptons to have masses close to 50 GeV. The data allow inclusion of one additional generation of heavy fermions in SUSY extension of Standard Model if chargino and neutrali...

Empirically, the formation of political attitudes has been strongly linked to the concept of group identification. Classifications such as race, gender, religion and ethnicity have been shown to be sharp predictors of many aspects of political life including who turns out to vote, how people vote, and the issues that are important to people. Furthermore, many topics that are of interest to poli...

We prove a complexity dichotomy theorem for the most general form of Boolean #CSP where every constraint function takes values in the complex number field C. This generalizes a theorem by Dyer, Goldberg and Jerrum [11] where each constraint function takes non-negative values. We first give a non-trivial tractable class of Boolean #CSP which was inspired by holographic reductions. The tractabili...

In this paper we obtain sharp bounds for the Green function and jumping function of a subordinate killed Brownian motion in a bounded C domain, where the subordinating process is a subordinator whose Laplace exponent has certain asymptotic behavior at infinity.

The large value of the top quark mass implies that the rare top decays t → bW+Z, sW+Z and dW+Z, and t → cW+W− and uW+W−, are kinematically allowed decays so long as mt ≥ mW +mZ +mdi ≈ 171.5 GeV+mdi or mt ≥ 2mW + mu,c ≈ 160.6 GeV + mu,c, respectively. The partial decay widths for these decay modes are calculated in the standard model. The partial widths depend sensitively on the precise value of...

In this paper the low energy limit of the BESS model is studied in a systematic way. The method consists in eliminating the heavy vector field, by use of its classical equations of motion, in the infinite mass limit. After the elimination of the heavy degrees of freedom we get additional terms to the Standard Model lagrangian. After a finite renormalization of the ordinary gauge bosons wave fun...

The widespread application of precision agriculture has triggered the expansion of tools for data collection and geo referencing of productivity, soil and crop properties. The correct data fusion of soil and crop parameters is a complex problem due to the abundance of inter-correlated parameters which necessitates the use of computational intelligence techniques. This paper proposes the combina...

Many phrase alignment models operate over the combinatorial space of bijective phrase alignments. We prove that finding an optimal alignment in this space is NP-hard, while computing alignment expectations is #P-hard. On the other hand, we show that the problem of finding an optimal alignment can be cast as an integer linear program, which provides a simple, declarative approach to Viterbi infe...