An Invitation to Hypoelliptic Operators and Hörmander's Vector Fields (SpringerBriefs in Mathematics)

Competing Operators and Their Applications to Boundary Value Problems (SpringerBriefs in Mathematics)

Manifolds, Vector Fields, and Differential Forms: An Introduction to Geometry (Springer Undergraduate Mathematics Series)

A Geometric Algebra Invitation to Space Time Physics, Robotics and Molecular Geometry...