The delta derivative of [xi] : T [right arrow] R is denoted by [[xi].sup.[DELTA]](t) and the operators antiderivative is denoted by [integral] [xi] (t)[DELTA]t.
The relationship between Prandtl stress functions corresponding to Lametensor fields [[LAMBDA].sub.n-1] and [[LAMBDA].sub.n] = ([h.sub.n-1] [omicron] [[PSI].sub.n-1]) [[LAMBDA].sub.n-1] is expressed by the formula [[PSI].sub.n] = [H.sub.n-1] [omicron] [[PSI].sub.n-1], with [H.sub.n-1] antiderivative of [h.sub.n-1] such that [[PSI].sub.n] is identically zero on the cross-sectional exterior boundary [partial derivative][[OMEGA].sub.0].
where [LAMBDA]'(-i[[partial derivative].sub.x]) = a[[partial derivative].sup.-2.sub.x] - b[[partial derivative].sup.2.sub.x], and the antiderivative [[partial derivative].sup.-1.sub.x] is defined by the Fourier transform such that
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