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Ivancevic_Applied-Diff-Geom

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Technical Preliminaries: Tensors, Actions and Functors 135tf = y, which for j > 1 satisfys(sf) = s(tf),t(sf) = t(tf)).Thus a j−cell can be visualized as a globe, a jD ball whose boundaryis divided into two (j − 1)D hemispheres corresponding to its source andtarget. However, in homotopy theory, the simplicial approach is much morepopular. In a simplicial set, each j−cell f is shaped like a jD simplex,and has j + 1 faces, certain (j − 1)−cells d 0 f, . . . , d n f. In addition tothese there are (j + 1)−cells i 0 f, . . . , i n+1 f called degeneracies, and theface and degeneracy maps satisfy certain well–known relations [Baez andDolan (1998)].

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