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arXiv 2007-11-09 DOI 10.2178/jsl/1245158088 1 views

Lawvere-Tierney sheaves in algebraic set theory

Awodey, Steve · Gambino, Nicola · Lumsdaine, Peter L. · Warren, Michael A.

Original · EN

We present a solution to the problem of defining a counterpart in Algebraic Set Theory of the construction of internal sheaves in Topos Theory. Our approach is general in that we consider sheaves as determined by Lawvere-Tierney coverages, rather than by Grothendieck coverages, and assume only a weakening of the axioms for small maps originally introduced by Joyal and Moerdijk, thus subsuming the existing topos-theoretic results.

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