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math.AP2005★ 1 cited
Intrinsic notion of principal symbol for the Heisenberg calculus
Raphael Ponge
In this paper we define an intrinsic notion of principal for the Hypoelliptic calculus on Heisenberg manifolds. More precisely, the principal symbol of a \psivdo appears as a homog…
math.AP2003
On the Asymptotic Completeness of the Volterra Calculus
Raphael Ponge
The Volterra calculus is a simple and powerful pseudodifferential tool for inverting parabolic equations and it has also found many applications in geometric analysis. On the other…