Ruziewicz problem
In
Lebesgue measurable
sets.
This was answered affirmatively and independently for n ≥ 4 by Grigory Margulis and Dennis Sullivan around 1980, and for n = 2 and 3 by Vladimir Drinfeld (published 1984). It fails for the circle.
The problem is named after Stanisław Ruziewicz.
References
- ISBN 0-8176-5075-X.
- Drinfeld, Vladimir (1984), "Finitely-additive measures on S2 and S3, invariant with respect to rotations", Funktsional. Anal. i Prilozhen., 18 (3): 77, MR 0757256.
- Margulis, Grigory (1980), "Some remarks on invariant means", Monatshefte für Mathematik, 90 (3): 233–235, MR 0596890.
- Sullivan, Dennis (1981), "For n > 3 there is only one finitely additive rotationally invariant measure on the n-sphere on all Lebesgue measurable sets", Bulletin of the American Mathematical Society, 4 (1): 121–123, MR 0590825.
- Survey of the area by Hee Oh