A construction of right groups from a connected groupoid.
À propos de «Toposes, triples and theories» de messieurs M. Barr et C. Wells
Abstract initiality
We study morphisms that are initial w.r.t. all functors in a given conglomerate. Several results and counterexamples are obtained concerning the relation of such properties to different notions of subobject. E.g., strong monomorphisms are initial w.r.t. all faithful adjoint functors, but not necessarily w.r.t. all faithful monomorphism-preserving functors; morphisms that are initial w.r.t. all faithful monomorphism-preserving functors are monomorphisms, but need not be extremal; and (under weak...
Algèbres graphiques (suites : Les bidules)
Algèbres graphiques (sur un concept de dimension dans les langages formels)
Algébricité, monadicité, esquissabilité et non-algébricité
Approche polygraphique des -catégories non strictes