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A Hadamard matrix is a type of square (-1,1)-matrix invented by Sylvester (1867) under the name of anallagmatic pavement, 26 years before Hadamard (1893) considered them. In ...

A database accessed by one or more hash functions.

e is transcendental.

A set of statistical distributions having different variances.

Heule graphs are a set of unit-distance graphs with chromatic number five derived by Marijn Heule in April 2018 to July 2918 from the 1581-vertex de Grey Graph (Heule 2018). ...

When all the points P on one line are related by an isometry to all points P^' on another, the midpoints of the segments PP^' are either distinct and collinear or coincident.

Definitions about a set which depend on the entire set.

Two objects which touch each other are said to be incident.

While an equality A=B states that two mathematical expressions are equal, an inequation A!=B states that two expressions are not equal.

A vector field v for which the curl vanishes, del xv=0.