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Pseudo-differential operator

operator on functions, defined by the composition of Fourier transformation, multiplication with a certain smooth function of both position and momentum, and inverse Fourier transformation

Pronunciation
/ˈsjuːdəʊ - ˌdɪfəˈrɛnʃəl ˈɒpəreɪtə/
/ˈsudoʊ - ˌdɪfəˈrɛntʃəl ˈɑpəˌreɪdər/
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