Matroid endomorphisms, derivatives, and Kolchin polynomials – Antongiulio Fornasiero (Università degli Studi di Firenze)


Dipartimento di Matematica, Sala Seminari.


Let d be a finite tuple of commuting derivations on a field K.

A classical result allows us to associate a numerical polynomial to d (the Kolchin polynomial), measuring the “growth rate” of d.  A multi-variate version of the same polynomial is also known.

We show that we can abstract from the setting of fields with derivations, and consider instead a matroid with a tuple d of commuting (quasi)-endomorphisms. In this setting too there exists a (multi-variate) Kolchin polynomial measuring the growth rate of d.

We can then consider the situation of an o-minimal structure K with a generic tuple d of commuting compatible derivations, and use the corresponding Kolchin polynomial to give a bound to the thorn rank of (K,d).


Joint work with E. Kaplan.

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