The key to Seymour’s Regular Matroid Decomposition Theorem is his result that each 3-connected regular matroid with no R10or R12-minor is graphic or cographic. We present a proof of this in terms of signed graphs. 2004 Wiley Periodicals, Inc. J Graph Theory 48: 74–84, 2005

We consider a general class of boundary terms of the open XYZ spin-1/2 chain compatible with integrability. We have obtained the general elliptic solution of K-matrix obeying the boundary Yang-Baxter equation using the R-matrix of the eight vertex model and derived the associated integrable spin-chain Hamiltonian. 1+1 dimensional integrable models with boundaries find interesting applications i...

Let S(R) be an o-minimal structure over R, T ⊂ Rk1+k2+l a closed definable set, and π1 : R k1+k2+l → R12 , π2 : R k1+k2+l → R, π3 : R k1+k2 → R2 the projection maps as depicted below.

I study how trade affects urbanization and real income. To this end, exploit large-scale exogenous changes in stemming from the redrawing of Hungary’s borders after First World War. show that counties near new border decreased significantly relative to farther away. rationalize reduced-form finding a spatial model which benefits trading drive agglomeration around locations where activity takes ...

Let S(R) be an o-minimal structure over R, T ⊂ R k1+k2+l a closed definable set, and π1 : R k1+k2+l → R12 , π2 : R k1+k2+l → R, π3 : R k1+k2 → R2 the projection maps as depicted below.

Bacillus aryabhattai strain SQU-R12 was isolated from date palm seedlings, where it showed a growth-promoting capacity by being able to synthesize indole-3-acetic acid phytohormone and reduce ethylene biosynthesis by producing 1-aminocyclopropane-1-carboxylic acid deaminase. The draft genome sequence of this strain is reported here.

This paper analyzes the impact of fiscal equalization on asymmetric tax competition when positive agglomeration externalities are present. It shows that equalization of standardized tax revenue improves the spatial allocation of capital provided that agglomeration externalities are sufficiently strong. JEL Classification: R12, H71, H73.

OBJECTIVES To determine the prevalence of potentially inappropriate prescribing (PIP) in a cohort of community-dwelling middle-aged people and assess the relationship between PIP and emergency department (ED) visits, general practitioner (GP) visits and quality of life (QoL). DESIGN Prospective cohort study. SETTING The Irish Longitudinal Study on Ageing (TILDA), a nationally representative...