14 citations · 62 across the 19 of their papers we have counts for
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math.AC2014★ 2 cited
On existence of canonical -bases
Daniel M. Hoffmann
We describe a general method for expanding a truncated G-iterative Hasse-Schmidt derivation, where G is an algebraic group. We give examples of algebraic groups for which our metho…
math.LO2014★ 9 cited
Existentially closed fields with G-derivations
Daniel Hoffmann, Piotr Kowalski
We prove that the theories of fields with Hasse-Schmidt derivations corresponding to actions of formal groups admit model companions. We also give geometric axiomatizations of thes…