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Johnson solid J_7.

Of opposite symmetry under reflection; mirror images.

A 90-sided polygon.

An enneacontahedron is a 90-faced polyhedron.

A 19-sided polygon, sometimes also called the enneakaidecagon.

A mathematical statement of the equivalence of two quantities. The equality "A is equal to B" is written A=B.

A point, such as interior points of a disk, such that (px)(py)=[const], where p is the chord length.

If an infinite number of points in the plane are all separated by integer distances, then all the points lie on a straight line.

A transformation which has only trivial invariant subsets is said to be ergodic.

The difference between a quantity and its estimated or measured quantity.