P

-

the name of the point

Px

-

the horizontal coordinate

Py

-

the vertical coordinate

form(P)

returns the form of the geometric

object (i.e., point2d if P is a point).

coordinates(P)

returns [Px,Py] where Px is the horizontal

horizontal coordinate and Py the

vertical coordinate of P.

HorizontalCoord(P)

returns Px which is the horizontal

coordinate of P.

VerticalCoord(P)

returns Py which is the vertical

coordinate of P.

detail(P)

returns a detailed expression of the

point P.