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2 votes
Accepted

Open problem 1.28: $W^{1,1}$ regularity for optimal transport map

The problem has indeed been solved by De Philippis-Figalli. The reference is: https://link.springer.com/article/10.1007/s00222-012-0405-4 the paper linked above is a subsequent, related, development o …
Nicola Gigli's user avatar
8 votes
Accepted

Reference request: Wasserstein metric spaces for non linear weights/mobility?

Yes, this issue has been considered. You can start having a look at `A new class of transport distances between measures' by Dolbeault, Nazaret and Savaré (http://link.springer.com/article/10.1007%2F …
Nicola Gigli's user avatar
7 votes
Accepted

About the metrizability of the space of Probability measures $\mathcal{P}(S)$

I'm not really sure what Villani wrote in his monograph, but it is true that one needs to prove that the weak topology is induced by a distance, as a priori it could be another topology with the same …
Nicola Gigli's user avatar