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math.LO2026
The doctrinal Gödel's completeness theorem and the type space functor
Marco Abbadini, Francesca Guffanti
We give a self-contained proof of Gödel's completeness theorem entirely within the formalism of first-order Boolean doctrines (an algebraic approach to classical many-sorted first…
math.LO2025
Freely adding one layer of quantifiers to a Boolean doctrine
Marco Abbadini, Francesca Guffanti
We describe the layer of quantifier alternation depth at most one of the quantifier completion of a Boolean doctrine over a small category. This amounts to a doctrinal version of H…
math.LO2025
Quantifier-free formulas and quantifier alternation depth in doctrines
Marco Abbadini, Francesca Guffanti
This paper aims to incorporate the notion of quantifier-free formulas modulo a first-order theory and the stratification of formulas by quantifier alternation depth modulo a first-…