Volume 110A, number 6 PHYSICS LETTERS 5 August 1985 CALCULATION OF THE a3 COEFFICIENT OF THE SCALAR FIELD BY THE POINT SEPARATION METHOD Dianyan XU Department of Computer Science and Technology, Peking University, Beijing, People's Republic of China Received 9 May 1985; accepted for publication 26 May 1985 The a3 coefficient is derived for the scalar field for arbitrary …