S. Y. LaiB. WiwatanapatapheSouthwest University of Finance and EcoNomicsMahidol University2018-05-032018-05-032011-10-19Dynamics of Continuous, Discrete and Impulsive Systems Series B: Applications and Algorithms. Vol.18, No.5 (2011), 647-657149287602-s2.0-80054069563https://repository.li.mahidol.ac.th/handle/20.500.14594/12136The objective of this paper is to establish an asymptotic theory of global solutions for a class of semilinear wave equations in two space dimensions. The validity of formal approximations for time t → ∞ is discussed in the classical sense of C 2 , and it is found that the global solution decays like (1 + t + |x|) -k (0 < k < 1/2).. Copyright © 2011 Watam Press.Mahidol UniversityMathematicsArticleSCOPUS