Decomposition using measurable functions.
CR ACAD SCI I-MATH
583 - 586.
It has been known for some time (although no proof has been published) that, given two Lebesgue-measurable sets A and B in R(n) that are equidecomposable under isometries g(1),...,g(k) belonging to an amenable group, then the characteristic functions chi(A) and chi(B) can be decomposed as sums of nonnegative Lebesgue-measurable functions f(i) and f(i)og(i)(-1) (i = 1,...,k), respectively. We give a simple direct proof using a linear operator mapping the space of bounded functions onto L(infinity).
|Title:||Decomposition using measurable functions|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Mathematics|
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