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Categories with dependent arrows
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abstract
We present an abstract, categorical formulation of dependent functions in a fundamental manner and independently from the Sigma-construction. For that, we define first the notion of a category with family-arrows, or a $\f$-category. A $(\f, \Sigma)$-category is a $\f$-category with Sigma-objects, where a $(\f, \Sigma)$-category with a terminal object is exactly a type-category of Pitts, or a category with attributes of Cartmell. We introduce categories with dependent arrows, or $\di$-categories, and we show that every $(\f, \Sigma)$-category is a $\di$-category in a canonical way. The notion of a Sigma-object in a $\di$-Category is affected by the existence of dependent arrows, and we show that every $(\f, \Sigma)$-category is a $(\di, \Sigma)$-category in a canonical way.
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Cited by 1 Pith paper
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Coinductive well-foundedness
An inhabited complemented subset of the natural numbers has a least element exactly when it is downset located, proved with a new coinductive well-foundedness principle DWF_N.
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