18,510 research outputs found
Three predictions on July 2012 Federal Elections in Mexico based on past regularities
Electoral systems are subject of study for physicist and mathematicians in
last years given place to a new area: sociophysics. Based on previous works of
the author on the Mexican electoral processes in the new millennium, he found
three characteristics appearing along the 2000 and 2006 preliminary dataset
offered by the electoral authorities, named PREP: I) Error distributions are
not Gaussian or Lorentzian, they are characterized for power laws at the center
and asymmetric lobes at each side. II) The Partido Revolucionario Institucional
(PRI) presented a change in the slope of the percentage of votes obtained when
it go beyond the 70% of processed certificates; hence it have an improvement at
the end of the electoral computation. III) The distribution of votes for the
PRI is a smooth function well described by Daisy model distributions of rank
in all the analyzed cases, presidential and congressional elections in
2000, 2003 and 2006. If all these characteristics are proper of the Mexican
reality they should appear in the July 2012 process. Here I discuss some
arguments on why such a behaviors could appear in the present processComment: 6 pages, one tabl
On Types of Elliptic Pseudoprimes
We generalize the notions of elliptic pseudoprimes and elliptic Carmichael
numbers introduced by Silverman to analogues of Euler-Jacobi and strong
pseudoprimes. We investigate the relationships among Euler Elliptic Carmichael
numbers , strong elliptic Carmichael numbers, products of anomalous primes and
elliptic Korselt numbers of Type I: The former two of these are introduced in
this paper, and the latter two of these were introduced by Mazur (1973) and
Silverman (2012) respectively. In particular, we expand upon a previous work of
Babinkostova et al. by proving a conjecture about the density of certain
elliptic Korselt numbers of Type I that are products of anomalous primes.Comment: Revised for publication. 33 page
Plausible families of compact objects with a Non Local Equation of State
We investigate the plausibility of some models emerging from an algorithm
devised to generate a one-parameter family of interior solutions for the
Einstein equations. It is explored how their physical variables change as the
family-parameter varies. The models studied correspond to anisotropic spherical
matter configurations having a non local equation of state. This particular
type of equation of state with no causality problems provides, at a given
point, the radial pressure not only as a function of the density but as a
functional of the enclosed matter distribution. We have found that there are
several model-independent tendencies as the parameter increases: the equation
of state tends to be stiffer and the total mass becomes half of its external
radius. Profiting from the concept of cracking of materials in General
Relativity, we obtain that those models become more stable as the family
parameter increases
Nonmeasurable subgroups of compact groups
In 1985 S.~Saeki and K.~Stromberg published the following question: {\it Does
every infinite compact group have a subgroup which is not Haar measurable?} An
affirmative answer is given for all compact groups with the exception of some
metric profinite groups known as strongly complete. In this spirit it is also
shown that every compact group contains a non-Borel subgroup
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