1 research outputs found

    Vertex and edge orbits of Fibonacci and Lucas cubes

    Full text link
    The Fibonacci cube Γn\Gamma_n is obtained from the nn-cube QnQ_n by removing all the vertices that contain two consecutive 1s. If, in addition, the vertices that start and end with 1 are removed, the Lucas cube Λn\Lambda_n is obtained. The number of vertex and edge orbits, the sets of the sizes of the orbits, and the number of orbits of each size, are determined for the Fibonacci cubes and the Lucas cubes under the action of the automorphism group. In particular, the set of the sizes of the vertex orbits of Λn\Lambda_n is \{k \ge 1;\ k \divides n\} \cup\, \{k \ge 18;\ k \divides 2n\}, the number of the vertex orbits of Λn\Lambda_n of size kk, where kk is odd and divides nn, is equal to \sum_{d\divides k}\mu\left(\frac{k}{d}\right) F_{\lfloor \frac{d}{2}\rfloor + 2}, and the number of the edge orbits of Λn\Lambda_n is equal to the number of the vertex orbits of Γn−3\Gamma_{n-3}. Dihedral transformations of strings and primitive strings are essential tools to prove these results
    corecore