3 papers
math.AG2026
Iterated Cartier Flux and Non-Finite Generation of Tame Polynomial Automorphism Groups over Finite Fields
Stefan Barańczuk, Tomasz Ślusarski
Let be a finite field of characteristic , and let \[ U_n(k)=\{F\in\operatorname{TA}_n(k):F(0)=0,\ JF(0)=I_n\}. \] We prove that every special tame polynomial aut…
math.NT2026
Polynomial representatives of finite-field maps: a sharp dimensional dichotomy
Stefan Barańczuk, Tomasz Ślusarski
Let . A polynomial representative of a finite-set map is a tuple of polynomials inducing that map on the rational-point grid. We prove a sharp distinction between a…
math.AG2026
Prescribed extension spectra of mock automorphisms over finite fields
Stefan BaraÅczuk, Tomasz Ålusarski
We classify the finite-extension permutation spectra occurring in an explicit family of mock automorphisms over finite fields. Every finite nonempty divisor-closed subset of $\N_{>…