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Oscillatory integrals of symbols of pseudo-differential operators on $R^n $ and operators of Fredholm type
Introduction.In this paper we shall introduce the oscillatory integral o the orm 0--[[e-'p(, x)dxd or C-unction p(, x)o class (defined in Section 1), and by using this integral study the algebra o pseudo-differential operators o2 class S?.,., 0=<3=<p=<1, 31, whose basic weight function 2 2(x, ) varies even in x …