Abstract
In this paper we develop the formalism of the Grothendieck six operations on o-minimal sheaves. The Grothendieck formalism allows us to obtain o-minimal versions of: (i) derived projection formula; (ii) universal coefficient formula; (iii) derived base change formula; (iv) Künneth formula; (v) local and global Verdier duality.
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Notes
In topology, Borsuk asked in 1937 if the product of a normal space and the unit interval is normal and the question was only solved, negatively, without any set theoretic conditions beyond the axiom of choice, in 1971 by Rudin [43]. We thank the referee for pointing this to us. So Theorem 2.20 is yet another manifestation of tameness of o-minimal structures.
Recall that a type \(\beta \) on X (i.e. an ultrafilter of definable subsets of X) is a definable type onX if and only if for every uniformly definable family \(\{Y_t\}_{t\in T}\) of definable subsets of X, the set \(\{t\in T: Y_t\in \beta \}\) is a definable set.
In topology it is trivial that \(g'^{-1}(\bullet )\) sends f-soft sheaves to \(f'\)-soft sheaves. Here this is not evident.
As usual in category theory [32], to avoid set theoretic issues, we assumed throughout the paper that we are working in a (very big) fixed universe, so below by small sum we mean a sum of a family indexed by a set in this universe.
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The first author was supported by Fundação para a Ciência e a Tecnologia, Financiamento Base 2008-ISFL/1/209. The second author is a member of the Gruppo Nazionale per l’Analisi Matematica, la Probabilità e le loro Applicazioni (GNAMPA) of the Istituto Nazionale di Alta Matematica (INdAM). This work is part of the FCT project PTDC/MAT/101740/2008.
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Edmundo, M.J., Prelli, L. The six Grothendieck operations on o-minimal sheaves. Math. Z. 294, 109–160 (2020). https://doi.org/10.1007/s00209-019-02274-0
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DOI: https://doi.org/10.1007/s00209-019-02274-0