Elegantly colored paths and cycles in edge colored random graphs

Lisa Espig, Alan Frieze, Michael Krivelevich

Research output: Contribution to journalArticlepeer-review


We first consider the following problem. We are given a fixed perfect matching M of [n] and we add random edges one at a time until there is a Hamilton cycle containing M. We show that with high probability (w.h.p.) the hitting time for this event is the same as that for the first time there are no isolated vertices in the graph induced by the random edges. We then use this result for the following problem. We generate random edges and randomly color them black or white. A path/cycle is said to be zebraic if the colors alternate along the path. We show that w.h.p. the hitting time for a zebraic Hamilton cycle coincides with every vertex meeting at least one edge of each color. We then consider some related problems and (partially) extend our results to multiple colors. We also briefly consider directed versions.

Original languageEnglish
Pages (from-to)1585-1618
Number of pages34
JournalSIAM Journal on Discrete Mathematics
Issue number3
StatePublished - 2018


  • Random graphs
  • Randomly edge colored
  • Zebraic


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