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By Pavel Exner, Jonathan P. Keating, Visit Amazon's Peter Kuchment Page, search results, Learn about Author Central, Peter Kuchment, , Toshikazu Sunada, and Alexander Teplyaev, Alexander Teplyaev

This publication addresses a brand new interdisciplinary region rising at the border among quite a few parts of arithmetic, physics, chemistry, nanotechnology, and machine technological know-how. the point of interest this is on difficulties and strategies with regards to graphs, quantum graphs, and fractals that parallel these from differential equations, differential geometry, or geometric research. additionally incorporated are such different subject matters as quantity conception, geometric team thought, waveguide concept, quantum chaos, quantum cord platforms, carbon nano-structures, metal-insulator transition, computing device imaginative and prescient, and communique networks. This quantity features a special choice of specialist experiences at the major instructions in research on graphs (e.g., on discrete geometric research, zeta-functions on graphs, lately rising connections among the geometric workforce thought and fractals, quantum graphs, quantum chaos on graphs, modeling waveguide structures and modeling quantum graph platforms with waveguides, regulate idea on graphs), in addition to study articles.

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En = o-. s:: o ~. 86081, Eigenvalues, <~JO--O cKJ Representative Polyene Family ~ Decomposition of Molecules with 2-Fold Symmetry 41 by the mirror plane fragment. This leads us to the concept of local symmetry (or hidden symmetry). Since within the HMO approximation only 1-2 interactions are taken into consideration, the absence or presence of symmetry associated with substituents attached to vertices lying on the mirror plane in the above examples has no consequence on the characteristic polynomial or eigenvalues of the right fragment, and the molecular graph as a whole does not need to possess symmetry but only needs to have local symmetry.

Molecules with n-Fold Symmetry [3] circulene [4] circulene corannulene n=3 n=4 n=5 57 [7] circulene coronene fr t n=7 n=6 -='(e EijHw+ w')(Eij) 2cos Ok irreducible subgraph Gu = L4 - 2cos Ok~ - (X - 2cos 0k)(X + 2 cos Ok) = X4 2x 3 cos Ok _4X2 + 4X cos Ok + 4cos 2 Ok + I - EB=(X -2cosOk ) 2kn Ok = - n for k = 0, I, 2, ... , n - 1 For k = 0, Ok = 0 and cos Ok = 1 for all values of n which gives the following characteristic polynomial and eigenvalues present in all circulenes. 2143 Fig. 9. 78165 Fig.

33536 )3,1,0, -1, -)3, -2 Eigenvalues, f3 ~ ~ '83 V> ~ ::. ;. ~. > -0 '< ~ .... ,j IV '" ~. ;. , ::s O· ~. 1. 7727 180047 . 27841 ~ Q ~ 3 '< ~ o p: '" ;. ~. en = o-. s:: o ~. 86081, Eigenvalues, <~JO--O cKJ Representative Polyene Family ~ Decomposition of Molecules with 2-Fold Symmetry 41 by the mirror plane fragment. This leads us to the concept of local symmetry (or hidden symmetry). Since within the HMO approximation only 1-2 interactions are taken into consideration, the absence or presence of symmetry associated with substituents attached to vertices lying on the mirror plane in the above examples has no consequence on the characteristic polynomial or eigenvalues of the right fragment, and the molecular graph as a whole does not need to possess symmetry but only needs to have local symmetry.

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