By MAN-WAH WONG

An creation to pseudo-differential operators. This version keeps the scope and magnificence of the unique textual content. A bankruptcy at the interchange of order of differentiation and integration is extra at first to make the ebook extra self-contained, and a bankruptcy on vulnerable suggestions of pseudo-differential equations is extra on the finish to augment the worth of the ebook as a piece on partial differential equations. numerous chapters are supplied with extra workouts. The bibliography is just a little improved and an index is further.

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9. (T h e F o u rie r In v ersio n F o rm u la) tempered distribution. Then Let T be a T =T , where T is defined by f{(p) = T{(p) ,

And in / G then 4. T E M PE R E D D ISTR IBU T IO N S We only give the rudiments of the theory of tempered distribu­ tions in this chapter. More details on this subject will be introduced in later chapters as the need arises. 1. A sequence of functions {^pj} in the Schwartz space

By a simple change of variable, we have {TyffiO = (27t) - ”/2 f e - - - « (r ,/ )(x )d x aR” = (27t)“ ”/^ / Jr ^ e“ ‘®'^/(x + y)dx = (27t) - ' ‘/2 f e-^^^-y^-^f{x)dx JR" = e*3'-«(27T)-"/2 f = e^^-^fiO = {MyM) ■ e-**-«/(x)dx 3. The Fourier Transform Also, 21 (M yfm = (27t) - / 2 [ e-^-<{Myf){x)dx = (27t)-"/2 f e-^^-^e'^y-^f{x)dx JR'^ = /(^ - y) = (T -yfm ■ Finally, by another change of variable, we have (D ,/K ? r/(f) = H - ( d j /)({ ). 5. P ro o f: Let (p{x) = e ^ . Then (p{^) = e ^ . 4) j=l J-°o 22 An Introduction to Pseudo-Differential Operators Hence it is sufficient to compute oo /-00 g - itc - t ^ ^ g ( - 00, 00) .

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