论文信息 - Bicategories of spans and relations

Bicategories of spans and relations

Abstract A new kind of bicategorical limit is used to characterize bicategories of the form Spant( E ) and Rel( E ) where in the former case E is a category with pullbacks and in the latter E is a regular category. The characterization of Rel( E ) differs from those in the literature which require involutions on the bicategories.

[1] Ross Street,et al. Fibrations in bicategories , 1980 .

[2] Ross Street,et al. Variation through enrichment , 1983 .

[3] Brian Day,et al. Limit spaces and closed span categories , 1974 .

[4] J. Benabou. Introduction to bicategories , 1967 .

[5] Ross Street,et al. ENRICHED CATEGORIES AND COHOMOLOGY , 1983 .