Uniqueness of Hamiltonian volume minimizing Lagrangian submanifolds   which are Hamiltonian isotopic to RP^n in CP^n
  The purpose of this short note is to prove the uniqueness of Hamiltonian volume minimizing Lagrangian submanifolds which are Hamiltonian isotopic to RP^n in CP^n modulo isometric group actions. 
Hiroshi Iriyeh