S. C. Power, Essential Spectra of Piecewise Continuous Fourier Integral Operators, Proceedings of the Royal Irish Academy. Section A: Mathematical and Physical Sciences, Vol. 81A, No. 1 (1981), pp.

Let X = {X t : t ≥ 0} be a stationary piecewise continuous ℝ d -valued process that moves between jumps along the integral curves of a given continuous vector field, and let S ᑕ ℝ d be a smooth ...