Tel Aviv Topology Conference: Rothenberg Festschrif : by Wolfgang Luck, Shmuel Weinberger, Michael Farber

By Wolfgang Luck, Shmuel Weinberger, Michael Farber

This quantity provides the court cases of the Tel Aviv foreign Topology convention held through the distinctive Topology application at Tel Aviv collage. The ebook is devoted to Professor Mel Rothenberg at the celebration of his sixty fifth birthday. His contributions to topology are good known---from the early paintings on triangulations to varied papers on transformation teams and on geometric and analytic facets of torsion concept. present examine regarding these contributions are stated during this ebook. assurance is incorporated at the following issues: vanishing theorems for the Dirac operator, the speculation of Reidemeister torsion (including limitless dimensional flat bundles), Nobikov-Shubin invariants of manifolds, topology of crew activities, Lusternik-Schnirelman idea for closed 1-forms, finite style invariants of hyperlinks and 3-manifolds, equivariant cobordisms, equivariant orientations and Thom isomorphisms, and extra.

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Will remain as an open question. V. Diudea and B. Szefler Omega Polynomial in Polybenzenes Omega Polynomial in 3-Periodic Polybenzenes O’Keeffe et al. 82 D (also polybenzene, Fig. 5), is described to belong to the space group Pn3m and having the topology of the diamond. The second structure (Fig. 82 P and it belongs to the space group Im3m, corresponding to the P-type surface. In fact these networks represent embeddings of the hexagon patch in the two surfaces of negative curvature, D and P, respectively (Szefler and Diudea 2012).

J Chem Inf Comput Sci 35:1011–1014 Harary F (1969) Graph theory. Addison-Wesley, Reading Imrich W, Klavžar S (1993) A simple O(mn) algorithm for recognizing Hamming graphs. Bull Inst Comb Appl 9:45–56 John PE, Khadikar PV, Singh J (2007a) A method of computing the PI index of benzenoid hydrocarbons using orthogonal cuts. J Math Chem 42:37–45 John PE, Vizitiu AE, Cigher S, Diudea MV (2007b) CI index in tubular nanostructures. MATCH Commun Math Comput Chem 57:479–484 Khadikar PV (2000) On a novel structural descriptor PI.

2 Omega Polynomial in 1-Periodic Polybenzenes The units BTA_48 (Fig. 5, left) and BTZ_24 (Fig. 7, left) can form “eclipsed” dimers that next provide hyper-pentagons (Fig. 7) and further multi-tori BTX20 (Fig. 8, left column) (Diudea and Szefler 2012). Multi-tori are complex structures consisting of more than one single torus (Diudea and Nagy 2007; Diudea 2005; Diudea and Petitjean 2008). They can appear as self-assembly products of some repeating units/monomers (formed eventually by spanning of cages/fullerenes), as in spongy carbon or in natural zeolites.

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