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A problem in the theory of algebraic invariants that was solved by Hilbert using an existence proof.

A metric characterizing the difference between two knots K and K^' in S^3.

A graded algebra over the integers Z. Cohomology of a space is a graded ring.

The index set for the collection of submodules in a graded module.

Consider the recurrence equation defined by a_0=m and a_n=|_sqrt(2a_(n-1)(a_(n-1)+1))_|, (1) where |_x_| is the floor function. Graham and Pollak actually defined a_1=m, but ...

The multiplicity of a multigraph is its maximum edge multiplicity.

A section of a graph obtained by finding its intersection with a plane.

The great dodecahedron is the Kepler-Poinsot polyhedron whose dual is the small stellated dodecahedron. It is also uniform polyhedron with Maeder index 35 (Maeder 1997), ...

The ancient Greeks used the 24 letters of their alphabet plus three special signs called episemons--vau or digamma or stigma (6), koppa or qoppa (90), and san or sampi ...

An element of order 2 in a group (i.e., an element A of a group such that A^2=I, where I is the identity element).