A Constellation of Origami Polyhedra by John Montroll

By John Montroll

N this attention-grabbing advisor for paperfolders, origami professional John Montroll presents easy instructions and obviously special diagrams for developing impressive polyhedra. step by step directions exhibit tips to create 34 diverse versions. Grouped based on point of trouble, the types variety from the straightforward Triangular Diamond and the Pyramid, to the extra complicated Icosahedron and the hugely hard Dimpled Snub dice and the excellent Stella Octangula.

A problem to devotees of the traditional jap paintings of paperfolding, those multifaceted marvels also will attract scholars and an individual attracted to geometrical configurations.

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R; F/ holds for all k; r if and only if the map k. Mr . /; F/ ! M; F/ induced by the inclusion Mr . / M is injective for all r. 2 of Morse–Cairns [379, p. 260], and we will omit it here, although we will make a few comments about some of the key ideas in the proof. p/ D r. For the sake of simplicity, assume that p is the only critical point at the critical level r. A fundamental result in critical point theory (see, for example, Milnor [359, pp. 12–24] or Morse–Cairns [379, pp. 184–202]) states that Mr .

44. A TPP immersion f W M 2 ! Rm of a smooth compact, connected manifold 2-dimensional surface M 2 is tight. Proof. Let lp be a nondegenerate linear height function on M 2 . lp / be the number of critical points of lp of index k. , łp has one minimum and one maximum on M 2 . M 2 / (see, for example, Milnor [359, p. 29]), 2 X . lp / D 2 X . M 2 ; Z2 / as well, and thus f is a tight immersion. t u Bound on the codimension of a substantial TPP immersion Another important result in the theory of tight immersions concerns the upper bound on the codimension of a substantial smooth TPP immersion.

Thus, it generalizes the classical result that the normal to a surface M in R3 is tangent to the evolute surface (focal set) when f has rank two (see, for example, Goetz [175]). M/ is also an immersed surface. M/ is a surface with singularities at the images under f of points where X D 0. For example, the evolute of an ellipse in a plane has singularities at the images of the four vertices. 8 is the following corollary. x/. Thus, the curvature sphere map K is constant along a leaf of T in U if and only if the focal map f is constant along that leaf.

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