Assertion: perturbation | /r/CapableOf | vary in space
Facets:
value: slowly
type: MANNER
Source sentences:
text: The λ-expansion described in Section 5.2 is suitable for treating perturbations that vary slowly in space, while the blip-function expansion and related methods of Section 5.3 provide a good description of reference systems for which the potential is rapidly varying but localised.