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An operator E such that E^ap(x)=p(x+a).

The number of operations needed to effect a geometric construction as determined in geometrography. If the number of operations of the five geometrographic types are denoted ...

If a line L is the Simson line of a point P on the circumcircle of a triangle, then P is called the pole of L (Honsberger 1995, p. 128).

Assemble six 1×2×2 blocks and three 1×1×1 blocks into a 3×3×3 cube.

A point which does not lie on at least one ordinary line.

A graphical partitioning based on the eigenvalues and eigenvectors of the Laplacian matrix of a graph.

Johnson solid J_(86).

Johnson solid J_(88).

The tangent indicatrix of a curve of constant precession is a spherical helix. The equation of a spherical helix on a sphere with radius r making an angle theta with the ...

A perimeter-bisecting line segment which originates at a vertex of a polygon. The three splitters of a triangle concur in a point known as the Nagel point Na.