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A Glossary of Mathematical Terms - N


A polygon with n sides.

Natural numbers

See Counting numbers.


A plane figure obtained by opening and flattening a 3-D object.

Nonagon (Enneagon)

A nine-sided polygon.


Used mainly for sets of points in wich not all segments connecting points of the set lie entirely in the set. It can be used also in the sense of Concave.

Null set

See Empty set.


See Fraction.

first published on september 01 2003 - last updated on september 01 2003