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A moving average may generate an irregular oscillation even if none exists in the original data.

A roll of two 1s (the lowest roll possible) on a pair of six-sided dice. The probability of rolling snake eyes is 1/36, or 2.777...%.

The 6-polyiamond illustrated above.

A local source is a node of a directed graph with no entering edges (Borowski and Borwein 1991, p. 401; left figure), and a global source (often simply called a source) is a ...

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

A moving average using 15 points having weights -3, -6, -5, 3, 21, 46, 67, 74, 67, 46, 21, 3, -5, -6, and -3. It is sometimes used by actuaries.

The placement of n points on a sphere so as to minimize the maximum distance of any point on the sphere from the closest one of the n points.

The 6-polyiamond illustrated above, named for its resemblance to the Great Sphinx of Egypt.

A spigot algorithm is an algorithm which generates digits of a quantity one at a time without using or requiring previously computed digits. Amazingly, spigot algorithms are ...

A square grid is a grid formed by tiling the plane regularly with squares.