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Questions about abstract measure and Lebesgue integral theory. Also concerns such properties as measurability of maps and sets.

7 votes

Which self homeomorphisms preserve measure on a torus, apart from affine?

As a simple example, if you take any divergence-free vector field, the flow generated by this vector field is incompressible, so preserves measures. In fact, there are a huge number of measure preserv …
Gabe K's user avatar
  • 6,001
4 votes

wasserstein distance between distributions with bounded ratio

Any estimate will need to incorporate the diameter of $X$. To see this, consider the interval $[0,L]$ and the distribution with density, $$\begin{cases} \frac{2}{L} & 0 \leq x \leq L/3 \\ …
Gabe K's user avatar
  • 6,001
1 vote

(Sub)Optimality of random transport

The reference for the fact that $r$ gets matched to $F_B^{-1}(F_R(r))$ can be found in Theorem 2.9 of [1]. In one-dimensional optimal transport, this is known as the monotone map. I believe that the o …
Gabe K's user avatar
  • 6,001