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 A simple proof of analytic characterization theorem for operator symbols Bull. Korean Math. Soc. 1997 Vol. 34, No. 3, 421-436 Dong Myung Chung, Tae Su Chung, and Un Cig Ji Sogang University, Sogang University, Yonsei University Abstract : In this paper we first give a simple proof of the analytic characterization theorems of the operator symbols by using the characterization theorem for white noise functionals. We next give a criterion for the convergence of operators on white noise functionals in terms of their symbols and then use this result to give a proof for the Fock expansion theorem of operators on white noise functionals. Keywords : $S$-transform, operator symbols, Fock expansion MSC numbers : 46F25 Downloads: Full-text PDF