Nonsmooth calculus. (English) Zbl 1124.28003
Author’s abstract: We survey recent advances in analysis and geometry, where first-order differential analysis has been extended beyond its classical smooth settings. Such studies have applications to geometric rigidity questions, but are also of intrinsic interest. The transition from smooth spaces to singular spaces where calculus is possible parallels the classical development from smooth functions to functions with weak or generalized derivatives. Moreover, there is a new way of looking at the classical geometric theory of Sobolev functions that is useful in more general contexts.
Reviewer: D. R. Bell (Jacksonville)
MSC:
| 28A75 | Length, area, volume, other geometric measure theory |
| 49J52 | Nonsmooth analysis |
| 53C23 | Global geometric and topological methods (à la Gromov); differential geometric analysis on metric spaces |
| 51-02 | Research exposition (monographs, survey articles) pertaining to geometry |
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