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A polygon with n sides.

See Counting numbers.

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

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.

See Empty set.

See Fraction.

copyright 2000 et seq. maddalena falanga & luciano battaia

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