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On the dependent product in toposes
Author(s) -
Caramello Olivia,
Zanfa Riccardo
Publication year - 2021
Publication title -
mathematical logic quarterly
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.473
H-Index - 28
eISSN - 1521-3870
pISSN - 0942-5616
DOI - 10.1002/malq.202000069
Subject(s) - topos theory , mathematics , product (mathematics) , pure mathematics , algebra over a field , geometry , art , literature
We give an explicit construction of the dependent product in an elementary topos, and a site‐theoretic description for it in the case of a Grothendieck topos. Along the way, we obtain a number of results of independent interest, including an expression for the operation of universal quantification on subobjects in terms of finite limits and power objects.