Abstract
The well-known duality between the Sobolev inequality and the Hardy–Littlewood–Sobolev inequality suggests that the Nash inequality could also have an interesting dual form, even though the Nash inequality relates three convex functionals instead of two. We provide such a dual form here with sharp constants. This dual inequality relates the L2 norm to the infimal convolution of the L∞ and H-1 norms. The computation of this infimal convolution is a minimization problem, which we solve explicitly, thus providing a new proof of the sharp Nash inequality itself. This proof, via duality, also yields the sharp form of some new, weighted generalizations of the Nash inequality as well as the dual of these weighted variants.
Original language | English (US) |
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Pages (from-to) | 129-144 |
Number of pages | 16 |
Journal | Bulletin of the London Mathematical Society |
Volume | 51 |
Issue number | 1 |
DOIs | |
State | Published - Feb 1 2019 |
All Science Journal Classification (ASJC) codes
- General Mathematics
Keywords
- 26A51
- 46E35 (primary)
- 46N10 (secondary)