| http://www.w3.org/ns/prov#value | - -mail: nkamsi@kku.ac.th ABSTRACT In this paper, we study the nonlinear equation of the form where is the ultra-hyperbolic operator iterated k-times, defined by , p + q = n is the dimension of the Euclidean space n, (x, t) = (x1, x2,..., xn, t) n?? (0, ), k is a positive integer and c is a positive constant.
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