Columbia subject headings:
Differential equations, Hypoelliptic.
Differential equations, Partial--Asymptotic theory.
Diffusion processes.
Manifolds (Mathematics)
Harvard subject headings:
Differential equations, Hypoelliptic.
Differential equations, Partial--Asymptotic theory.
Diffusion processes.
Manifolds (Mathematics)
Princeton subject headings:
Differential equations, Hypoelliptic.
Differential equations, Partial--Asymptotic theory.
Diffusion processes.
Manifolds (Mathematics)