Suspension flow
= Suspension flow
A suspension flow moves vertically in the <mapping torus> of a diffeomorphism, applying that diffeomorphism whenever an orbit crosses the identifying section. A <hyperbolic toral automorphism> with constant roof gives a three-dimensional <Anosov flow>: after $k$ crossings its transverse derivative is $A^k$, while the remaining fractional time contributes a uniformly bounded factor.