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The Official Website of Manchester City FC Get the latest Man City news, injury updates, fixtures, player signings, match highlights & much more!In the rst case x2f 1(E), while in the second case x2f 1(F) Either way x2f 1(E)f (F), whence f 1(EF) f 1(E)f (F) Now let y2f 1(E) f 1(F) Then either f(y) 2Eor f(y) 2F Either way, f(y) 2EF, so we∆u = 0 and its inhomogeneous version, Poisson's equation, ¡∆u = f We say a function u satisfying Laplace's equation is a harmonic function 31 The Fundamental Solution Consider Laplace's equation in Rn, ∆u = 0 x 2 Rn Clearly, there are a lot of functions u Fd Fc Or Fb Which Do U Prefer B.u.f.f. culinary