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A property of a space which is also true of each of its subspaces. Being "first-countable" is hereditary, but having a given genus is not.

A Heronian tetrahedron, also called a perfect tetrahedron, is a (not necessarily regular) tetrahedron whose sides, face areas, and volume are all rational numbers. It ...

A set of statistical distributions having different variances.

(1) Based on or involving trial and error. (2) Convincing without being rigorous.

A 6-polyabolo.

A 60-sided polygon.

A set of six.

An algebra which is a special case of a logos.

A generalization of a solid such as a cube or a sphere to more than three dimensions. A four-dimensional version of a polyhedron is known as a polytope.

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.