A Framework for Formalizing Set Theories Based on the Use of Static Set Terms

Arnon Avron
Tel Aviv University
We present a new unified framework for formalizations of axiomatic set theories of different strength, from rudimentary set theory to full ZF . It allows the use of set terms, but provides a static check of their validity. Like the inconsistent “ideal calculus” for set theory, it is essentially based on just two set-theoretical principles: extensionality and comprehension (to which we add ∈-induction and optionally the axiom of choice). Comprehension is formulated as: x ∈ {x | ϕ} ↔ ϕ, where {x | ϕ} is a legal set term of the theory. In order for {x | ϕ} to be legal, ϕ should be safe with respect to {x}, where safety is a relation between..
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The Middle Ground-Ancestral Logic.Liron Cohen & Arnon Avron - 2019 - Synthese 196 (7):2671-2693.

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