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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.

A polynomial in which the sum of subscripts is the same in each term.

To rearrange without cutting or pasting.

The Jacobi polynomials, also known as hypergeometric polynomials, occur in the study of rotation groups and in the solution to the equations of motion of the symmetric top. ...