We study chiral symmetry breaking in quenched strong-coupling QED4 in arbitrary covariant gauge within the Dyson-Schwinger equation formalism. A recently developed numerical renormalization program is fully implemented. Results are compared for three different fermion-photon proper vertex Ansätze : bare γ, minimal Ball-Chiu, and Curtis-Pennington. The procedure is straightforward to implement a...

Fitz-Hugh-Curtis syndrome is characterized by an inflammation of the perihepatic capsules associated with pelvic inflammatory disease. The typical symptom is severe right upper quadrant abdominal pain. We report a patient with Fitz-Hugh-Curtis syndrome who presented with an atypical chief complaint of right-side chest pain unaccompanied by symptoms specific to pelvic inflammatory disease. This ...

the parasitoid wasps of the genera leiophron nees and euphorus nees were studied in northern iran (guilan, mazandaran and alborz provinces). the specimens were collected using malaise traps from different habitats during 2010-2011. four species of both genera were collected and identified, of which three species, euphorus pallidistigma (curtis), e. similis (curtis) and leiophron fascipennis (ru...

The partition function is fundamental for probabilistic graphical models—it is required for inference, parameter estimation, and model selection. Evaluating this function corresponds to discrete integration, namely a weighted sum over an exponentially large set. This task quickly becomes intractable as the dimensionality of the problem increases. We propose an approximation scheme that, for any...

The well known Andrews-Curtis Conjecture [2] is still open. In this paper, we establish its finite version by describing precisely the connected components of the Andrews-Curtis graphs of finite groups. This finite version has independent importance for computational group theory. It also resolves a question asked in [5] and shows that a computation in finite groups cannot lead to a counterexam...

If X is a discrete abelian group and A a finite set, then a cellular automaton (CA) is a continuous map F : A −→ A that commutes with all X-shifts. If φ : A −→ R, then, for any a ∈ A, we define Σφ(a) = ∑ x∈X φ(ax) (if finite); φ is conserved by F if Σφ is constant under the action of F. We characterize such conservation laws in several ways, deriving both theoretical consequences and practical ...

Anthropologists have long puzzled over why certain objects and activities are avoided, reviled, or proscribed in many cultures. Numerous theories have been proposed, but as Reinhart (1990) suggests above, a full explanation remains elusive. Psychologists recently have begun to explore the nature of the revulsion that is occasioned by the sight of excreta, rotten food, slime, and bugs. They have...