نتایج جستجو برای: cw complex

تعداد نتایج: 789594  

Journal: :International Journal of Mathematics 2021

We provide unipotent factorizations of vector bundle automorphisms real and complex bundles over finite dimensional locally CW-complexes. This generalizes work Thurston–Vaserstein Vaserstein for trivial bundles. also address two symplectic cases propose a geometric analog the problem in setting holomorphic Stein manifolds.

1997
Jeffrey A. Strom

Ganea conjectured that for any finite CW complex and any k > 0, cat(X×Sk) = cat(X) + 1. In this paper we prove two special cases of this conjecture. The main result is the following. Let X be a (p − 1) connected n dimensional CW complex (not necessarily finite). We show that if cat(X) = ⌊ n p ⌋ + 1 and n 6≡ −1 mod p (which implies p > 1), then cat(X×Sk) = cat(X) + 1. This is proved by showing t...

2016
JAMES F. DAVIS

The main theorem states that if K is a finite CW-complex with finite fundamental group G and universal cover homotopy equivalent to a product of spheres X, then G acts smoothly and freely on X×Sn for any n greater than or equal to the dimension of X. If the G-action on the universal cover of K is homologically trivial, then so is the action on X × Sn. Ünlü and Yalçın recently showed that any fi...

2007
M. Salvetti

In [DP03], [Ra02] it was proven that the complement to a hyperplane arrangement in C is a minimal space, i.e. it has the homotopy type of a CW -complex with exactly as many i-cells as the i-th Betti number bi. The arguments use (relative) Morse theory and Lefschetz type theorems. This result of ”existence” was refined in the case of complexified real arrangements in [Yo05]. The author consider ...

Journal: :International Journal of Infrared and Millimeter Waves 2007

Journal: :Experimental Mathematics 2009
Alexander Engström

A discrete Morse function for a simplicial complex describes how to construct a homotopy equivalent CW-complex with hopefully fewer cells. We associate a boolean function with the simplicial complex and construct a discrete Morse function using its Fourier transform. Methods from theoretical computer science by O’Donnell, Saks, Schramm, and Servedio, together with experimental data on complexes...

Journal: :Journal of animal science 1986
S A Zinn L T Chapin H A Tucker

Effects of photoperiod on growth, eating patterns and clearance rate, secretion rate and half-life of growth hormone in serum were assessed in Holstein heifers. Sixty-four prepubertal heifers (avg body wt 102 kg) were blocked by weight into four groups of 16. Within block, each animal was randomly assigned to one of four photoperiod treatments: 16 h of cool-white fluorescent light:8 h dark (CW-...

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