The Collaborative International Dictionary
Complex of lines
Complex \Com"plex\, n. [L. complexus] Assemblage of related things; collection; complication.
This parable of the wedding supper comprehends in it
the whole complex of all the blessings and privileges
exhibited by the gospel.
--South.
Complex of lines (Geom.), all the possible straight lines in space being considered, the entire system of lines which satisfy a single relation constitute a complex; as, all the lines which meet a given curve make up a complex. The lines which satisfy two relations constitute a congruency of lines; as, the entire system of lines, each one of which meets two given surfaces, is a congruency.