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math.AP2025
Stratification of the Helffer-Nourrigat cone
Clément Cren
Given a singular filtration on a manifold, e.g. a subriemannian setting, one can understand the elliptic regularity problems through a special kind of calculus. The principal symbo…
math.AP2025
Transverse parabolic structures and transverse BGG sequences
Clément Cren
Manifolds endowed with a parabolic geometry in the sense of Cartan come with natural sequences of differential operators and their analysis provide the so called (curved) BGG seque…