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Given a Euclidean n-space, H_n=n+1.

A 70-sided polygon.

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.

e is transcendental.

A set of statistical distributions having different variances.

A 6-polyabolo.

A 60-sided polygon.

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.