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4 - Finitary Set Functors

Published online by Cambridge University Press:  30 January 2025

Jiří Adámek
Affiliation:
Czech Technical University in Prague
Stefan Milius
Affiliation:
Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
Lawrence S. Moss
Affiliation:
Indiana University, Bloomington
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Summary

This chapter discusses terminal coalgebras obtained by methods other than the finitary iteration that we saw in Chapter 3. One way is by taking a quotient of a weakly terminal coalgebra. Another is to use Worrell’s Theorem: the terminal coalgebra of a finitary set functor is obtainable as a limit, using a doubled form of infinite iteration. The chapter also contains a number of presentations of the terminal coalgebra of the finite power-set functor on sets and of the first infinite limit of its terminal-coalgebra chain.

Type
Chapter
Information
Initial Algebras and Terminal Coalgebras
The Theory of Fixed Points of Functors
, pp. 90 - 132
Publisher: Cambridge University Press
Print publication year: 2025

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  • Finitary Set Functors
  • Jiří Adámek, Czech Technical University in Prague, Stefan Milius, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany, Lawrence S. Moss, Indiana University, Bloomington
  • Book: Initial Algebras and Terminal Coalgebras
  • Online publication: 30 January 2025
  • Chapter DOI: https://doi.org/10.1017/9781108884112.005
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  • Finitary Set Functors
  • Jiří Adámek, Czech Technical University in Prague, Stefan Milius, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany, Lawrence S. Moss, Indiana University, Bloomington
  • Book: Initial Algebras and Terminal Coalgebras
  • Online publication: 30 January 2025
  • Chapter DOI: https://doi.org/10.1017/9781108884112.005
Available formats
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Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Finitary Set Functors
  • Jiří Adámek, Czech Technical University in Prague, Stefan Milius, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany, Lawrence S. Moss, Indiana University, Bloomington
  • Book: Initial Algebras and Terminal Coalgebras
  • Online publication: 30 January 2025
  • Chapter DOI: https://doi.org/10.1017/9781108884112.005
Available formats
×