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Table of Contents
Hörmander's operators: what they are
Hörmander's operators: why they are studied
A priori estimates in Sobolev spaces
Geometry of Hörmander's vector fields
Beyond Hörmander's operators.
Hörmander's operators: why they are studied
A priori estimates in Sobolev spaces
Geometry of Hörmander's vector fields
Beyond Hörmander's operators.