We explore regions of parameter space in a simple exponential model of the form V = V0 e −λ Q Mp that are allowed by observational constraints. We find that the level of fine tuning in these models is not different from more sophisticated models of dark energy. We study a transient regime where the parameter λ has to be less than √ 3 and the fixed point ΩQ = 1 has not been reached. All values o...

Model checking of infinite state systems is undecidable, therefore, there are instances for which fixpoint computations used in infinite state model checkers do not converge. Given a widening operator one can compute an upper approximation of a least fixpoint in finite number of steps even if the least fixpoint is uncomputable. We present a widening operator for automata encoding integer sets. ...

A dynamical system perturbed by white noise in a neighborhood of an unstable fixed point is considered. We obtain the exit asymptotics in the limit of vanishing noise intensity. This is a refinement of a result by Kifer (1981).

We study the well-posedness of the fixed point problem for self-mappings of a metric space which are φ-max-contractions (see [6]).

This study deals with an establishment of some common fixed point theorems for weak sub sequential continuous and compatibility of type (E) maps via C-class functions in a non Archimedean Menger Probabilistic Metric space.

A lot of authors have proved various common fixed-point results for pairs of self-mappings under strict contractive conditions in metric spaces. In the case of cone metric spaces, fixed point results are usually proved under assumption that the cone is normal. In the present paper we prove common fixed point results under strict contractive conditions in cone metric spaces using only the assump...

Existence of common fixed points is established for two self-mappings satisfying a generalized contractive condition. The presented results generalize several well known comparable results in the literature. We also study well-posedness of a common fixed point problem related to these mappings. Full text

We study the infrared properties of a class of non supersymmetric gauge theories with the same field content of N = 4 Super Yang-Mills and we show that the N = 4 supersymmetric model represents an IR unstable fixed point for the renormalization group equations. Partially supported by EEC, Science Project ERBFMRX-ct96-0045. email [email protected]

Abstract The Linear Complementarity Problem ) , ( q M LCP is to find a vector x in n IR satisfying 0  x , 0   q Mx and x T (Mx+q)=0, where M as a matrix and q as a vector, are given data. In this paper we show that the linear complementarity problem is completely equivalent to finding the fixed point of the map x = max (0, (I-M)x-q); to find an approximation solution to the second problem, w...