<p>In this paper, we introduce the second-order Sobolev spaces on Cayley graphs. We also prove the second-order Sobolev inequalities and the existence of extremal functions for best constants in supercritical cases. As an application, we derive positive ground state solutions for the <i>p</i>-biharmonic equations and the Lane-Emden systems on Cayley graphs of groups of polynomial growth.</p>

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Extremal functions for the second-order Sobolev inequality on Cayley graphs

  • Bobo Hua,
  • Ruowei Li,
  • Florentin Münch

摘要

In this paper, we introduce the second-order Sobolev spaces on Cayley graphs. We also prove the second-order Sobolev inequalities and the existence of extremal functions for best constants in supercritical cases. As an application, we derive positive ground state solutions for the p-biharmonic equations and the Lane-Emden systems on Cayley graphs of groups of polynomial growth.