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math.AG2019
Algebraic groups as difference Galois groups of linear differential equations
Annette Bachmayr, Michael Wibmer
We study the inverse problem in the difference Galois theory of linear differential equations over the difference-differential field with derivation …
math.AG2019
Solving difference equations in sequences: Universality and Undecidability
Gleb Pogudin, Thomas Scanlon, Michael Wibmer
We study solutions of difference equations in the rings of sequences and, more generally, solutions of equations with a monoid action in the ring of sequences indexed by the mon…
math.AG2019★ 3 cited
Free Proalgebraic Groups
Michael Wibmer
Replacing finite groups by linear algebraic groups, we study an algebraic-geometric counterpart of the theory of free profinite groups. In particular, we introduce free proalgebrai…