Generalization of the concept of variety and quasivariety to partial algebras through category theory
CONTENTSIntroduction ................................................................................................5§1. The purely category theoretical version of Birkhoff's theorem................7§2. Category theoretical study of generalized identities............................19§3. Generalized identities in partial algebras.............................................29§4. Calculus...............................................................................................41§5. Examples.............................................................................................47§6....