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Menger curvature and rectifiability | J. C. Léger
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1 May 1999 | Journal: | Ann. of Math. (2) 149 (1999), no. 3, 831-869 | Subject: | Metric Geometry | math.MG | Abstract: | For a Borel set E in R^n, the total Menger curvature of E, or c(E), is the integral over E^3 (with respect to 1-dimensional Hausdorff measure in each factor of E) of c(x,y,z)^2, where 1/c(x,y,z) is the radius of the circle passing through three points x, y, and z in E. Let H^1(X) denote the 1-dimensional Hausdorff measure of a set X. A Borel set E in R^n is purely unrectifiable if for any Lipschitz function gamma from R to R^n, H^1(E cap gamma(R)) = 0. It is said to be rectifiable if there exists a countable family of Lipschitz functions gamma_i from R to R^n such that H^1(E - union gamma_i(R)) = 0. It may be seen from this definition that any 1-set E (that is, E Borel and 0 | Source: | arXiv, math.MG/9905212 | Services: | Forum | Review | PDF | Favorites |
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