The homotopy-wedge theorem for near-prisms

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Let XX be a near-prism in direction ii, and define Bi(X)=del⁡iX∖link⁡iXB_i(X)=\operatorname{del}_i X\setminus\operatorname{link}_i X. Suppose that del⁡iX\operatorname{del}_i X is homotopy equivalent to a wedge of spheres

del⁡iX≃⋁jSjrj.\operatorname{del}_i X\simeq\bigvee_j S_j^{r_j}.

Near-prism homotopy theorem. Then XX is homotopy equivalent to a wedge of spheres, specifically

X≃⋁jSjrj+ci,j,X\simeq\bigvee_j S_j^{r_j+c_{i,j}},

where ci,jc_{i,j} is the number of jj-dimensional cells in Bi(X)B_i(X). This gives a recursive description of the homotopy type of near-prisms from that of their deletion and the cells in the associated boundary difference.

References

Primary source

Art M. Duval, Caroline J. Klivans and Jeremy L. Martin, “Cellular spanning trees and Laplacians of cubical complexes”, arXiv:0908.1956 (2010).

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