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International Congress of Mathematicians

International Congress of Mathematicians

International Congress of Mathematicians

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with multipliers m satisfyingSingular Integrals Aleet Modulation Invariance 723Ö a m(£') 1/n. Then it is easy to arrange (see Figure "Cone") thesupport <strong>of</strong> rrij to be in(B(0,2 j ) \ B(0,2 j - 2 j) x (B(0,2 j+n ) \ B(0,2 j - n j) x B(0,2 i+n ) n - 3 .Using smoothness <strong>of</strong> the multiplier rrij we may use Fourier expansion to writeit as rapidly converging sum <strong>of</strong> multipliers <strong>of</strong> elementary tensor formnÄ,i(£i)Ä,i(£ 2 )n^i(eo1=3with £„ = — Y^j=i C»-i- The symbol estimates prevail for these elementary tensors,and thus we observe(d/d0 a (fiu)(0

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