second neighborhood problem

unsolved problem about oriented graphs

en-GB/sɪˈkɒnd ˈneɪbəˌhʊd ˈpɹɒbləm/
en-US/ˈsɛkənd ˈneɪbɚˌhʊd ˈpɹɑbləm/

หมวดหมู่:

conjecture