A disc of unitradius on a plane is called a unit disc. Unless otherwise specified, the unit disc on a Cartesian plane[?] is the unit disc about the origin. The unit disc may be either closed or open, that is to say, either be
closed: the set of points with radius less than or equal to one from the centre
open: the set of points with radius less than one from the centre
... Whig, NY
Dixon Hall Lewis[?] (Senator), Democrat, AL
Thomas Watkins Ligon[?] (Representative), Democrat, MD
Edward Henry Carroll Long[?] (Representative), Whig, ...