Two non-isomorphic graphs are twins if each is isomorphic to a subgraph of the other. We prove that a rayless graph has either infinitely many twins or none.
Anthony Bonato, Henning Bruhn, Reinhard Diestel, P...
This paper aims to present a new upper bound on the size of separating hash families. This bound improves previously known bounds for separating hash families of general type. Key...