On projectively quotient functors

T. F. Zhuraev

Commentationes Mathematicae Universitatis Carolinae (2001)

  • Volume: 42, Issue: 3, page 561-573
  • ISSN: 0010-2628

Abstract

top
We introduce notions of projectively quotient, open, and closed functors. We give sufficient conditions for a functor to be projectively quotient. In particular, any finitary normal functor is projectively quotient. We prove that the sufficient conditions obtained are necessary for an arbitrary subfunctor of the functor 𝒫 of probability measures. At the same time, any “good” functor is neither projectively open nor projectively closed.

How to cite

top

Zhuraev, T. F.. "On projectively quotient functors." Commentationes Mathematicae Universitatis Carolinae 42.3 (2001): 561-573. <http://eudml.org/doc/248802>.

@article{Zhuraev2001,
abstract = {We introduce notions of projectively quotient, open, and closed functors. We give sufficient conditions for a functor to be projectively quotient. In particular, any finitary normal functor is projectively quotient. We prove that the sufficient conditions obtained are necessary for an arbitrary subfunctor $\mathcal \{F\}$ of the functor $\mathcal \{P\}$ of probability measures. At the same time, any “good” functor is neither projectively open nor projectively closed.},
author = {Zhuraev, T. F.},
journal = {Commentationes Mathematicae Universitatis Carolinae},
keywords = {projectively closed functor; finitary functor; functor of probability measures; projectively closed functor; finitary functor; functor of probability measures},
language = {eng},
number = {3},
pages = {561-573},
publisher = {Charles University in Prague, Faculty of Mathematics and Physics},
title = {On projectively quotient functors},
url = {http://eudml.org/doc/248802},
volume = {42},
year = {2001},
}

TY - JOUR
AU - Zhuraev, T. F.
TI - On projectively quotient functors
JO - Commentationes Mathematicae Universitatis Carolinae
PY - 2001
PB - Charles University in Prague, Faculty of Mathematics and Physics
VL - 42
IS - 3
SP - 561
EP - 573
AB - We introduce notions of projectively quotient, open, and closed functors. We give sufficient conditions for a functor to be projectively quotient. In particular, any finitary normal functor is projectively quotient. We prove that the sufficient conditions obtained are necessary for an arbitrary subfunctor $\mathcal {F}$ of the functor $\mathcal {P}$ of probability measures. At the same time, any “good” functor is neither projectively open nor projectively closed.
LA - eng
KW - projectively closed functor; finitary functor; functor of probability measures; projectively closed functor; finitary functor; functor of probability measures
UR - http://eudml.org/doc/248802
ER -

References

top
  1. Shchepin E.V., Functors and uncountable powers of compact spaces, Uspekhi Mat. Nauk 36 (1981), 3 3-62. (1981) MR0622720
  2. Basmanov V.N., Covariant functors, retracts and dimension, Dokl. Akad. Nauk USSR 271 (1983), 1033-1036. (1983) Zbl0544.54007MR0722013
  3. Chigogidze A.Ch., Extension of normal functors, Vestnik Mosk. Univ. Ser. I Mat. Mekh. 6 (1984), 40-42. (1984) Zbl0588.54016MR0775298
  4. Fedorchuk V.V., Probability measures in topology, Uspekhi Mat. Nauk 46 (1991), 1 41-80. (1991) Zbl0735.54033MR1109036
  5. Fedorchuk V.V., Filippov V.V., General Topology: Basic Constructions, Moscow, Mosk. Gos. Univ., 1988. Zbl0658.54001MR1095303
  6. Engelking R., General Topology, Warszawa, PWN, 1977. Zbl0684.54001MR0500780

NotesEmbed ?

top

You must be logged in to post comments.

To embed these notes on your page include the following JavaScript code on your page where you want the notes to appear.

Only the controls for the widget will be shown in your chosen language. Notes will be shown in their authored language.

Tells the widget how many notes to show per page. You can cycle through additional notes using the next and previous controls.

    
                

Note: Best practice suggests putting the JavaScript code just before the closing </body> tag.