Type A surfaces are the locally homogeneous affine surfaces which can be locally described by constant Christoffel symbols. We address the issue of the geodesic completeness of these surfaces: we show that some models for ...

We study symmetric affine surfaces which have non-vanishing torsion tensor. We give a complete classification of the local geometries possible if the torsion is assumed parallel. This generalizes a previous result of Opozda ...

We give a detailed description of the torsors that correspond to multiloop algebras. These algebras are twisted forms of simple Lie algebras extended over Laurent polynomial rings. They play a crucial role in the construction ...

Envenenamento por serpentes é um importante problema de saúde pública em vários países tropicais e subtropicais, pois além da mortalidade, pode resultar em sequelas permanentes como consequência de danos locais, representando ...

There are many advances related to the the rationality of the moduli space ��H��,1 parametrising pointed smooth projective curves of genus �� ≥ 0 and Weierstrass semigroup H at the marked point. The semigroups studied in ...