-: Z :-


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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.

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© 2003-2009 Wendy Krieger