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In a boarding school there are fifteen schoolgirls who always take their daily walks in rows of threes. How can it be arranged so that each schoolgirl walks in the same row ...

A term in social choice theory meaning a change favorable for X does not hurt X.

Orthogonal contravariant and covariant satisfy g_(ik)g^(ij)=delta_k^j, where delta_j^k is the Kronecker delta.

A point at which two polygon edges of a polygon meet.

A plane figure for which quadrature is possible is said to be quadrable.

A type of binary tree.

The words random and stochastic are synonymous.

The word "spectrum" confusingly has a number of unrelated meanings in various branches of mathematics.

An alternating sign matrix is a matrix of 0s, 1s, and -1s in which the entries in each row or column sum to 1 and the nonzero entries in each row and column alternate in ...

Archimedes' cattle problem, also called the bovinum problema, or Archimedes' reverse, is stated as follows: "The sun god had a herd of cattle consisting of bulls and cows, ...