Assertion: wave's number | /r/HasProperty | counted in space
Facets:
value: at a certain moment
type: TEMPORAL
value: from a snapshot
type: OTHER
Source sentences:
text: In the case of a group velocity different from the phase velocity, a consequence is that the number of waves counted in a wave group is different when counted from a snapshot in space at a certain moment, from when counted in time from the measured surface elevation at a fixed position.