منابع مشابه
A Co-free Construction for Elementary Doctrines
We provide a construction which co-freely adds elementary structure to a primary doctrine in the sense of Lawvere. We show that the construction preserves all the first order logical structures that the starting doctrine may have. Moreover it forces the Principle of Propositional Extensionality when applied to tripos.
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ژورنال
عنوان ژورنال: Journal of Pure and Applied Algebra
سال: 2020
ISSN: 0022-4049
DOI: 10.1016/j.jpaa.2020.106445