ThomassenGraph returns a hypotraceable graph, a graph G that has no Hamiltonian path but whose subgraph G - v for every vertex v has a Hamiltonian path.

Turan[n, p] constructs the Turán graph, the extremal graph on n vertices that does not contain CompleteGraph[p].

VertexConnectivityGraph[g] returns a directed graph that contains an edge corresponding to each vertex in g and in which edge-disjoint paths correspond to vertex-disjoint ...

VertexNumberPosition is an option that can be used in ShowGraph to display a vertex number in a certain position relative to the vertex.

Wheel[n] constructs a wheel on n vertices, which is the join of CompleteGraph[1] and Cycle[n - 1].

Arrow has been added to the built-in Mathematica kernel. New directive Arrowheads has been added to the built-in Mathematica kernel.

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}.

QuarterTone is an interval list in which each semitone (100 cents) is split in two.

SixthTone is an interval list in which each semitone (100 cents) is split in three.

RydbergConstant is an atomic constant appearing in the Rydberg formula expressing the wave-numbers of the lines in a spectral series.