Morphisms which are continuous on a neighborhood of the base of a groupoid

Research paper by Madalina Roxana Buneci

Indexed on: 26 Nov '05Published on: 26 Nov '05Published in: Mathematics - Category Theory


Kirill Mackenzie raised the following question: given a groupoid morphism $F$ which is continuous on a neighborhood of base, is it true that $F$ is continuous everywhere? This paper gives a negative answer to that question. Moreover, we prove that for a locally compact groupoid $G$ with non-singleton orbits and having open target projection, if we assume that the continuity of every morphism $F$ on the neighborhood of the base in $G$ implies the continuity of $F$ everywhere, then the groupoid $G$ must be locally transitive.