Results 271 to 280 of about 1,642,029 (305)

On Covers and Envelopes in Some Functor Categories

, 2013
We study the existence of covers and envelopes by some special functors on the category of finitely presented modules. As an application, we characterize some important rings using these functors.
L. Mao
semanticscholar   +1 more source

Categories and Functors

2015
We define the concepts of category, functor, and morphism of functors (‘natural transformation’). The set-theoretic difficulty in treating cases like the category of all sets is handled using Grothendieck’s Axiom of Universes. Epimorphisms, monomorphisms, and similar concepts are investigated. The concept of “enriched categories” (for example, additive
openaire   +2 more sources

Functor - Category Semantics of Programming Languages and Logics

Category Theory and Computer Science, 1985
R. D. Tennent
semanticscholar   +1 more source

An overview of real‐world data sources for oncology and considerations for research

Ca-A Cancer Journal for Clinicians, 2022
Lynne T Penberthy, Melissa A Bruno, Anne-marie Meyer   +2 more
exaly  

An attention‐based category‐aware GRU model for the next POI recommendation

International Journal of Intelligent Systems, 2021
Aixiang Pei, Yihong Yang, Yuwen Liu
exaly  

Bidirectional GRU networks‐based next POI category prediction for healthcare

International Journal of Intelligent Systems, 2022
Jun Shen, Lianyong Qi, Mohammad R Khosravi   +2 more
exaly  

Triangulated Categories and Functors

2019
We start with the abstract theory of triangulated categories and triangulated functors. Because the octahedral axiom plays no role in our book, we give it minimal attention. Then we introduce the homotopy category K(A,M), which has the same objects as C(A,M), and its morphisms are the degree 0 cohomology classes of the morphisms of C(A,M).
openaire   +2 more sources

A Typology of Functors and Categories

1988
Recent work on visual cognition by Hoffman (e.g. 1983) challenges the traditional notion that the basic units in visual analysis, the cognitive primitives, are geometric figures.2 He argues, rather, that the cognitive primitives for vision are properties of boundaries.
openaire   +2 more sources

On closed categories of functors

1970
Brian Day Received November 7, 19~9 The purpose of the present paper is to develop in further detail the remarks, concerning the relationship of Kan functor extensions to closed structures on functor categories, made in "Enriched functor categories" | 1] §9.
openaire   +2 more sources

On contravariant functors from the category of preschemes over a field into the category of abelian groups (with an application to the picard functor)

, 1964
J. Murre
semanticscholar   +1 more source