By R. Keith Dennis

ISBN-10: 0387119655

ISBN-13: 9780387119656

ISBN-10: 3540119655

ISBN-13: 9783540119654

**Read Online or Download Algebraic K-theory: Proceedings of a conference held at Oberwolfach, June 1980, Part I PDF**

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**Additional resources for Algebraic K-theory: Proceedings of a conference held at Oberwolfach, June 1980, Part I**

**Example text**

Let (J = (va, VI, V2) be a face of H containing Va and let (-)n be the restriction of (-) to the edges of H". A proof using the rigidity of Conjecture 1 and the generalized ring lemma, similar to the proof of the hexagonal packing lemma of [10], shows that there is a sequence En decreasing w w 22 Philip L. Bowers and Monica K. Hurdal to zero such that, if 'Hn is any oriented circle packing for (Hn' en), and if Tn is the triangle in C formed by connecting the centers of the circles in 'Hn corresponding to VO, VI, and V2 and T is the triangle formed by connecting the centers of the circles in the unique packing 'H corresponding to Vo, VI, and V2, then the vertex preserving affine map from Tn to T has dilatation at most 1 + Cn.

Instead, we use the Gauss-Bonnet theorem [4,10,1] which proposes a very simple equality, valid over any surface patch. AM KG dA = 27r - L Ej j where the Ej are the external angles of the boundary, as indicated in Figure 3(c). Note that this simplified form results from the fact that the integral of geodesic curvature on the piece-wise linear boundaries is zero. If we apply this expression to a Voronoi region, the external angles are zero across each edge (since the boundary stays perpendicular to the edge), and the external angle at a circumcenter is simply equal to ()j, the angle of the triangle at the vertex P.

Building upon previous work in discrete geometry, these operators are closely related to the continuous case, guaranteeing an appropriate extension from the continuous to the discrete setting: they respect most intrinsic properties of the continuous differential operators. We show that these estimates are optimal in accuracy under mild smoothness conditions, and demonstrate their numerical quality. We also present applications of these operators, such as mesh smoothing, enhancement, and quality checking, and show results of denoising in higher dimensions, such as for tensor images.

### Algebraic K-theory: Proceedings of a conference held at Oberwolfach, June 1980, Part I by R. Keith Dennis

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