Microsoft Store
 

Hausdorff paradox


 

In mathematics, the Hausdorff paradox, named after Felix Hausdorff, states that if you remove some countable subset of the sphere S², the remainder can be divided into three subsets A, B and C such that A, B, C and B ∪C are all congruent. In particular, it follows that on S² there is no "finitely additive measure" defined on all subsets such that the measure of congruent sets is equal.

See also