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The three diagonal points of a complete quadrilateral are never collinear.

The index set for the collection of submodules in a graded module.

Johnson solid J_(23).

A quantity from which another (the subtrahend) is subtracted.

Consider the process of taking a number, multiplying its digits, then multiplying the digits of numbers derived from it, etc., until the remaining number has only one digit. ...

An 8-polyiamond.

A relation R on a set S is reflexive provided that xRx for every x in S.

An alternative spelling of the name "Chebyshev."

One of the 14 4-polyaboloes.

(x^2+axy+by^2)(t^2+atu+bu^2)=r^2+ars+bs^2, (1) where r = xt-byu (2) s = yt+xu+ayu. (3)