Long cycles in hypercubes with optimal number of faulty vertices

  • Authors:
  • Jiří Fink;Petr Gregor

  • Affiliations:
  • Department of Applied Mathematics, Faculty of Mathematics and Physics, Charles University in Prague, Praha 1, Czech Republic 118 00;Department of Theoretical Computer, Science and Mathematical Logic, Charles University in Prague, Praha 1, Czech Republic 118 00

  • Venue:
  • Journal of Combinatorial Optimization
  • Year:
  • 2012

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Abstract

Let f(n) be the maximum integer such that for every set F of at most f(n) vertices of the hypercube Q n , there exists a cycle of length at least 2 n 驴2|F| in Q n 驴F. Castañeda and Gotchev conjectured that $f(n)=\binom{n}{2}-2$ . We prove this conjecture. We also prove that for every set F of at most (n 2+n驴4)/4 vertices of Q n , there exists a path of length at least 2 n 驴2|F|驴2 in Q n 驴F between any two vertices such that each of them has at most 3 neighbors in F. We introduce a new technique of potentials which could be of independent interest.