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math.CT2019
Sheaf theoretic characterization of etale groupoids
Koji Yamazaki
The study of Haeflier suggests that it is natural to regard a pseudogroup as an etale groupoid. We show that any etale groupoid corresponds to a pseudogroup sheaf, a new generaliza…
math.SG2019
Developing Maps and Engel Automorphisms
Koji Yamazaki
A completely nonintegrable -dimensional distribution on a -manifold is called an Engel structure. A -manifold with an Engel structure is called an Engel manifold. The deve…