An algebraic construction of predicate transformers
The paper deals with the assignments \[ C \mapsto \text{Map} C, \quad C \mapsto \text{Span} C \] for certain preorder-enriched categories [cf. \textit{A. Carboni}, \textit{S. Kasangian} and \textit{R. Street}, ``Bicategories of spans and relations'', J. Pure Appl. Algebra 33, 259-267 (1984; Zbl 0577.18005)] and gives conditions for these operators to be inverse to each other. Several applications as indicated by the title are presented in detail.
scientific article; zbMATH DE number 609578