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Well-Pointed Coalgebras

For endofunctors of varieties preserving intersections, a new description of the final coalgebra and the initial algebra is presented: the former consists of all well-pointed coalgebras. These are the pointed coalgebras having no proper subobject and no proper quotient. The initial algebra consists of all well-pointed coalgebras that are well-founded in the sense of Osius and Taylor. And initial algebras are precisely the final well-founded coalgebras. Finally, the initial iterative algebra consists of all finite well-pointed coalgebras. Numerous examples are discussed e.g. automata, graphs, and labeled transition systems.

preprint2013arXivOpen access
Jiří AdámekStefan MiliusLawrence S MossLurdes Sousa
Logic in Computer Sciencemath.CT
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Jiří AdámekStefan MiliusLawrence S MossLurdes Sousa

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