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**Z#***- The set Zn is the span of the chords of a {N}-gon.
*Z-span**- The integral span over a set of vectors or numbers.
*zero, at**- The result of inversion of at infinity. A isocurve that contains the point at zero is flat in the inversion-geometry. Holes at zero are interior to the solid (but not cavities).
*Zero-Curvature**-
An isocurve having Euclidean geometry. Unlike other curves, this retains
the same curvature on dilation.

Constructions in horo- are preferred **zettix**- A seven-dimensional manifold, from which one makes zettons. See hedrix for details.
**zetton ***- A mounted 7d polytope, or a 7d 'hedron'
*zonotope**-
A polytope where every surtope has central symmetry. Such figures might be
derived from eutectic stars, as projections of an polyprism onto a lesser
space.

For example, the rhombic dodecahedron is a zonotope, because its surhedra all have central symmetry. It can be viewed as a projection of the tesseract or tetraprism onto a three-dimensional space.

The pentagonal dodecahedron is not a zonotope, because pentagons do not have centre of symmetry. *ZZ**- The sum of sets Z#, or the span of all chords of all polygons.

**Gloss:**Home Intro A B C D E F G
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R S T Th U V W X Y **Z**

© 2003-2009 Wendy Krieger