Free algebras in varieties

Jan Pavlík

Archivum Mathematicum (2010)

  • Volume: 046, Issue: 1, page 25-38
  • ISSN: 0044-8753

Abstract

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We define varieties of algebras for an arbitrary endofunctor on a cocomplete category using pairs of natural transformations. This approach is proved to be equivalent to one of equational classes defined by equation arrows. Free algebras in the varieties are investigated and their existence is proved under the assumptions of accessibility.

How to cite

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Pavlík, Jan. "Free algebras in varieties." Archivum Mathematicum 046.1 (2010): 25-38. <http://eudml.org/doc/37651>.

@article{Pavlík2010,
abstract = {We define varieties of algebras for an arbitrary endofunctor on a cocomplete category using pairs of natural transformations. This approach is proved to be equivalent to one of equational classes defined by equation arrows. Free algebras in the varieties are investigated and their existence is proved under the assumptions of accessibility.},
author = {Pavlík, Jan},
journal = {Archivum Mathematicum},
keywords = {cocomplete category; free algebra; variety; natural transformation; cocomplete category; free algebra; variety; natural transformation},
language = {eng},
number = {1},
pages = {25-38},
publisher = {Department of Mathematics, Faculty of Science of Masaryk University, Brno},
title = {Free algebras in varieties},
url = {http://eudml.org/doc/37651},
volume = {046},
year = {2010},
}

TY - JOUR
AU - Pavlík, Jan
TI - Free algebras in varieties
JO - Archivum Mathematicum
PY - 2010
PB - Department of Mathematics, Faculty of Science of Masaryk University, Brno
VL - 046
IS - 1
SP - 25
EP - 38
AB - We define varieties of algebras for an arbitrary endofunctor on a cocomplete category using pairs of natural transformations. This approach is proved to be equivalent to one of equational classes defined by equation arrows. Free algebras in the varieties are investigated and their existence is proved under the assumptions of accessibility.
LA - eng
KW - cocomplete category; free algebra; variety; natural transformation; cocomplete category; free algebra; variety; natural transformation
UR - http://eudml.org/doc/37651
ER -

References

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  3. Adámek, J., Porst, H., From varieties of algebras to covarieties of coalgebras, Math. Structures Comput. Sci. (2001). (2001) Zbl1260.08004
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  5. Adámek, J., Trnková, V., Birkhoff’s variety theorem with and without free algebras, Theory Appl. Categ. 14 (18) (2005), 424–450. (2005) Zbl1086.18003MR2211426
  6. Barr, M., 10.1007/BF01111838, Math. Z. 116 (1970), 307–322. (1970) Zbl0194.01701MR0272849DOI10.1007/BF01111838
  7. Kelly, G. M., 10.1017/S0004972700006353, Bull. Austral. Math. Soc. 22 (1) (1980), 1–83. (1980) Zbl0437.18004MR0589937DOI10.1017/S0004972700006353
  8. MacLane, S., Categories for the working mathematician, Springer-Verlag, 1971. (1971) MR0354798
  9. Reiterman, J., 10.1007/BF01214925, Math. Z. 161 (2) (1978), 137–146. (1978) Zbl0363.18007MR0498325DOI10.1007/BF01214925
  10. Reiterman, J., On locally small based algebraic theories, Comment. Math. Univ. Carolin. 27 (2) (1986), 325–340. (1986) Zbl0598.18003MR0857552

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