On descent for coalgebras and type transformations

Publish Year: 1395
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:

JR_CGASAT-5-1_004

تاریخ نمایه سازی: 23 شهریور 1400

Abstract:

We find a criterion for a morphism of coalgebras over a Barr-exact category to be effective descent and determine (effective) descent morphisms for coalgebras over toposes in some cases. Also, we study some exactness properties of endofunctors of arbitrary categories in connection with natural transformations between them as well as those of functors that these transformations induce between corresponding categories of coalgebras.  As a result, we find conditions under which the induced functors preserve natural number objects as well as a criterion for them to be exact. Also this enable us to give a criterion for split epis in a category of coalgebras to be effective descent.

Authors

Maurice Kianpi

Laboratory of Algebra, Geometry and Applications, Department of Mathematics, Faculty of Science, University of Yaounde ۱, P.O. Box ۸۱۲, Yaounde, Republic of Cameroon.

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