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The symbol v variously means "disjunction" (i.e., OR in logic) or "join" (for a lattice).

Oriented in an up-down position.

In the American system, 10^(63).

The generalization of a Voronoi polygon to n dimensions for n>2.

Solving the wave equation on a disk gives a solution in terms of Bessel functions.

A surface represented parametrically by elliptic functions.

A finite division algebra is a field.

A three-dimensional surface with constant vector field on its boundary which traps at least one trajectory which enters it.

The geometric centroid of a quadrilateral lamina is the center of its Wittenbauer's parallelogram.

A method of constructing uniform polyhedra.