VertexNumber is an option that can take on values True or False. This can be used in ShowGraph to display or suppress vertex numbers.
VertexNumberPosition is an option that can be used in ShowGraph to display a vertex number in a certain position relative to the vertex.
VertexStyle is an option that allows the user to associate different sizes and shapes to vertices.
Ray
(Computational Geometry Package Symbol) Ray[{x_1, y_1}, {x_2, y_2}] is an object representing the infinite ray beginning at {x_1, y_1}in the direction of the point {x_2, y_2}.
RoundingRule is an option to SetArithmetic that specifies the rounding scheme to use.
BesselSimplify[expr] transforms Bessel functions in expr, trying to either decrease the number of Bessel functions, or convert Bessel functions into more elementary functions.
GammaSimplify[expr] transforms gamma functions in expr, trying to either decrease the number of gamma functions, or convert combinations of them into more elementary ...
PolyGammaSimplify[expr] transforms polygamma functions in expr, trying to either decrease the number of polygamma functions, or convert combinations of them into more ...
PolyLogSimplify[expr] transforms polylogarithm functions in expr, trying to either decrease the number of polylogarithm functions, or convert combinations of them into more ...
ZetaSimplify[expr] transforms zeta functions in expr, trying to either decrease the number of zeta functions, or convert combinations of them into more elementary functions.