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**band**over a fixed topological space X is represented by a cover X= union U_alpha, U_alpha subset= X, and for each alpha, a sheaf of groups K_alpha on U_alpha along with ...A topological transformation in which a surface is made out of an infinitely elastic material which, however, may not be torn or cut. Using this simple prescription gives the ...

A board covered by a lattice of pegs around which one can span

**rubber**bands to form segments and polygons. It was invented by the Egyptian mathematician and pedagogist Caleb ...Algebraic topology is the study of intrinsic qualitative aspects of spatial objects (e.g., surfaces, spheres, tori, circles, knots, links, configuration spaces, etc.) that ...

A polyhedron consisting of a n-gon, a parallel 2n-gon rotated a half-edge turn, and a

**band**of paired triangles separated by pentagons. The only true member giving a ...In order for a

**band**-limited (i.e., one with a zero power spectrum for frequencies nu>B) baseband (nu>0) signal to be reconstructed fully, it must be sampled at a rate nu>=2B. ...The Möbius strip, also called the twisted cylinder (Henle 1994, p. 110), is a one-sided nonorientable surface obtained by cutting a closed

**band**into a single strip, giving ...Quantization is a nonlinear process which generates additional frequency components (Thompson et al. 1986). This means that the signal is no longer

**band**-limited, so the ...A general n-gonal antiprism is a polyhedron consisting of identical top and bottom n-gonal faces whose periphery is bounded by a

**band**of 2n triangles with alternating up-down ...There are no fewer than two closely related but somewhat different notions of gerbe in mathematics. For a fixed topological space X, a gerbe on X can refer to a stack of ...

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