A cosymplectic groupoid is a Lie with multiplicative structure. We provide several structural results for groupoids and we discuss the relationship between groupoids, Poisson of corank 1, oversymplectic 1.

Using the recently developed groupoidal description of Schwinger’s picture Quantum Mechanics, a new approach to Dirac’s fundamental question on role Lagrangian in Mechanics is provided. It shown that function [Formula: see text] groupoid configurations (or kinematical groupoid) quantum system determines state von Neumann algebra histories system. This function, which we call q-Lagrangian, can b...

The purpose of this paper is to describe orbifolds in terms of (a certain kind of) groupoids. In doing so, I hope to convince you that the theory of (Lie) groupoids provides a most convenient language for developing the foundations of the theory of orbifolds. Indeed, rather than defining all kinds of structures and invariants in a seemingly ad hoc way, often in terms of local charts, one can us...

A complex Lie algebroid is a complex vector bundle over a smooth (real) manifold M with a bracket on sections and an anchor to the complexified tangent bundle of M which satisfy the usual Lie algebroid axioms. A proposal is made here to integrate analytic complex Lie algebroids by using analytic continuation to a complexification of M and integration to a holomorphic groupoid. A collection of d...

We describe a local model for any singular Riemannian foliation in neighborhood of closed saturated submanifold stratum. Moreover, we construct Lie groupoid that controls the transverse geometry linear approximation around these submanifolds. also discuss closure this and its algebroid.

We obtain Drinfeld second realization of the quantum affine superalgebras associated with the affine Lie superalgebra D(1)(2, 1;x). Our results are analogous to those obtained by Beck for the quantum affine algebras. Beck’s analysis uses heavily the (extended) affine Weyl groups of the affine Lie algebras. In our approach the structures are based on a Weyl groupoid. Preprint numbers: MIT-CTP 38...

Let G be a Lie groupoid over M such that the target-source map from G to M ×M is proper. We show that, if O is an orbit of finite type (i.e. which admits a proper function with finitely many critical points), then the restriction G|U of G to some neighborhood U of O in M is isomorphic to a similar restriction of the action groupoid for the linear action of the transitive groupoid G|O on the nor...

We introduce the notion of cofoliation on a stack. A cofoliation is a change of the differentiable structure which amounts to giving a full representable smooth epimorphism. Cofoliations are uniquely determined by their associated Lie algebroids. Cofoliations on stacks arise from flat connections on groupoids. Connections on groupoids generalize connections on gerbes and bundles in a natural wa...