14 citations · 22 across the 3 of their papers we have counts for
3 papers
math.AC2011★ 14 cited
Existence of -parameterized Picard-Vessiot extensions over fields with algebraically closed constants
Michael Wibmer
The purpose of this short note is to establish the existence of -parameterized Picard-Vessiot extensions of systems of linear difference-differential equations over diffe…
math.AC2010★ 6 cited
A Chevalley theorem for difference equations
Michael Wibmer
By a theorem of Chevalley the image of a morphism of varieties is a constructible set. The algebraic version of this fact is usually stated as a result on "extension of specializat…
math.AC2006★ 2 cited
Groebner bases for families of affine or projective schemes
Michael Wibmer
Let be an ideal of the polynomial ring over the commutative, noetherian ring . Geometrically defines a family of affine schemes over $\Spec(A)$: Fo…