By Hans Triebel
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Additional info for Function Spaces and Wavelets on Domains (EMS tracts in mathematics, vol.7)
Let be an arbitrary domain in Rn with 6D Rn . For any u 2 N there are orthonormal u-wavelet bases in L2 . 31. Proof. Step 1. 131). 128). 1/ 2 . 2/ 2 . / is orthogonal to L2 . /. 2/ 2 . /. 89) (recall that S0 D ;). They fit in the above scheme and need not to be considered. 92). These are boundary elements. 4 (iii). 0 Step 2. First we deal with the one-dimensional model case D . 1; 0/. 130) be an interval centred at 2 r for some suitable negative integer r and of side-length 2 l . 137) with G D F (scaling function) or G D M (wavelet).
4 (i), (iii). 35). 136) one obtains an orthonormal basis in L2 . / with D . 31. Since everything is local this proves also the theorem for arbitrary domains in R. Step 3. The corresponding assertion for arbitrary domains in Rn with n 2 j can be reduced to the 1-dimensional case. 130) (excluding again the basic wavelets). We assume that the right face with respect to the x1 -direction, say, x1 D 2 l r C 2 l 1 as in the above 1-dimensional model case, 0 is part of the left face of an admitted Whitney cube QlC1;r 0 .
26. First we need the corresponding sequence spaces. 32. Let s 2 R, 0 < p Ä 1, 0 < q Ä 1. 161) such that X s;per kD k jfpq ˇ 2jsq ˇ j;G m j m. 163) j;G;m with the usual modification if p D 1 and/or q D 1, where j m is the characteristic function of a cube with the left corner 2 j L m and of side-length 2 j L (a subcube of T n ). 33. 24. w/ and apq be the corresponding sequence spaces. 149). 160), one has the following basic assertion. 34. Let u 2 N. T n /. 153), Proof. 167) are orthonormal. T n /.
Function Spaces and Wavelets on Domains (EMS tracts in mathematics, vol.7) by Hans Triebel