There are many results in mathematics that are both new and elementary. Graph theory, which abounds in theorems of this kind, is the source of an interesting self-contained example which we present in this article.
Haicheng MaDanyang LiChengling Xie
Wu, PuJiang, HuiqinNazari-Moghaddam, SakinehSheikholeslami, Seyed MahmoudShao, ZehuiVolkmann, Lutz
Pu WuHuiqin JiangS. Nazari-MoghaddamSeyed Mahmoud SheikholeslamiZehui ShaoLutz Volkmann
Qiyue LiHanyuan DengZikai Tang