Stability Theorems in Geometry and Analysis by Yu. G. Reshetnyak (auth.)

By Yu. G. Reshetnyak (auth.)

This is often one of many first monographs to accommodate the metric concept of spatial mappings and contains leads to the speculation of quasi-conformal, quasi-isometric and different mappings.
the most topic is the examine of the steadiness challenge in Liouville's theorem on conformal mappings in area, that is consultant of a few difficulties on balance for transformation periods. To let this research quite a lot of mathematical instruments has been constructed which include the calculus of version, estimates for differential operators like Korn inequalities, houses of features with bounded suggest oscillation, and so on.
effects bought by way of others discovering comparable subject matters are pointed out, and a survey is given of guides treating proper questions or related to the process proposed.
This quantity might be of serious worth to graduate scholars and researchers drawn to geometric functionality conception.

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1 ) holds almost everywhere in U. 1) holds for almost all x E U is designated as K(f, U), or simply K(f) if misunderstanding is impossible. Such a mapping I is called quasiconlormal if it also satisfied the additional condition: C3. I is a homeomorphism. ) IE W;,loc(U) and J(x,1) has constant sign on U; ((3) there exists a set E C U of measure zero such that if x E U \ E and J (x, I) = 0 then the linear mapping I' (x) equals zero; ('Y) there exists a number K ~ 1 such that at each point x E U \ E C E (E is the set indicated in condition ((3)) with J(x, I) =J 0 the value K[f'(x)] does not exceed K.

Denote by M(ae) the union of all the balls B(e(s),as) with a = dll. Following J. Viiisruii [130], we call the set M(a,e) the "carrot" constructed from the rectifiable curve eCs), 0 ~ s ~ I. The definition of domains of class J(d,D) can be restated as follows: U is a domain of class J(d, D) if for every point x E U we can construct a rectifiable curve e(s), 0 ~ s ~ I, for which e(O) = x, eCl) = a, the length I of the curve does not exceed D, and the carrot M(a,e), a = dll, is included in U. We say that U is a domain of class J provided that there are numbers d and D, 0 < d ~ D < 00, such that U E J(d,D).

From condition (1) it follows that the mapping 0 does not vanish at the points of the cube Q* if a is sufficiently small (it suffices for a to be less than 1/8). This circumstance implies the fact that in the cube Q the matrix-valued function 0' (x) behaves like a constant in a certain sense. The precise meaning of the words will be clarified later. For every x E Q we have I(x) = O(g(x)). 21 ) Introduction 49 Since the points x and g(x) are close, the matrix (6'(x))-16'(g(x)) is almost identical; in consequence, the expression on the right-hand side almost equals 6'(x )[g'(x)lj.

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