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Given ∠AXB+∠AYB=pi radians in the above figure, then X and Y are said to be antigonal points with respect to A and B.

A paradox or contradiction.

The first of several addends, or "the one to which the others are added," is sometimes called the augend. Therefore, while a, b, and c are addends in a+b+c, a is the augend.

A puzzle involving disentangling a set of rings from a looped double rod, originally used by French peasants to lock chests (Steinhaus 1999). The word "baguenaudier" means ...

The number 13.

A pair of consecutive numbers.

Cantellation, also known as (polyhedron) expansion (Stott 1910, not to be confused with general geometric expansion) is the process of radially displacing the edges or faces ...

A variable which belongs to exactly one of a finite number of categories.

The direct limit of the cohomology groups with coefficients in an Abelian group of certain coverings of a topological space.

The number of empty neighbors of a cluster.