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    STUDIA CHEMIA - Issue no. 2 / 2003  
         
  Article:   CAPRA – A LEAPFROG RELATED MAP OPERATION.

Authors:  MIRCEA V. DIUDEA.
 
       
         
  Abstract:  A map M is a combinatorial representation of a closed surface. Its corresponding graph can be either a periodic covering or an irregular one. Several operations on the map allow its transformation in tilings eventually of chemical interest. A new operation called “capra" is defined and exemplified. It is compared with the well known leapfrog and quadrupling transformations and its implications in the adjacency matrix eigenvalue spectra discussed.  
         
     
         
         
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