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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).

A birotunda in which the bases are in opposite orientations.

A cupolarotunda in which the bases are in opposite orientations.

Johnson solid J_(24).

Johnson solid J_(47).

Johnson solid J_(44).

A type of integral named after Henstock and Kurzweil. Every Lebesgue integrable function is HK integrable with the same value.