COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring. |

University of Cambridge > Talks.cam > Geometric Analysis and Partial Differential Equations seminar > From Ornstein's non-inequalities to rank-one convexity

## From Ornstein's non-inequalities to rank-one convexityAdd to your list(s) Download to your calendar using vCal - Jan Kristensen (University of Oxford, OxPDE)
- Monday 03 December 2012, 15:00-16:00
- CMS, MR11.
If you have a question about this talk, please contact Filip Rindler. Questions about sharp integral estimates for partial derivatives of mappings can often be recast as questions about quasiconvexity of associated integrands. Quasiconvexity was introduced by Morrey in his work on weak lower semicontinuity in the Calculus of Variations. It is by now recognized as a central notion within the Calculus of Variations, but it remains somewhat mysterious. A closely related notion is that of rank-one convexity. Rank-one convexity is a necessary condition for quasiconvexity, and it is easy to check whether or not a given integrand is rank-one convex. Unfortunately, rank-one convexity is not equivalent to quasiconvexity. An example of Sverak shows that, in high dimensions, there exists a quartic polynomial that is rank-one convex but not quasiconvex. However, it is still plausible that rank-one convexity could be equivalent to quasiconvexity within more restricted classes of integrands. An interesting class being the positively one homogeneous integrands. Their quasiconvexity properties correspond to L1-estimates. In this talk I briefly review the convexity notions from the Calculus of Variations. I then show how the above viewpoint can be used to give a proof, and a generalization, of Ornstein’s non-L1-inequalities. This talk is part of the Geometric Analysis and Partial Differential Equations seminar series. ## This talk is included in these lists:- All CMS events
- All Talks (aka the CURE list)
- CMS Events
- CMS, MR11
- DPMMS Lists
- DPMMS Pure Maths Seminar
- DPMMS info aggregator
- DPMMS lists
- Geometric Analysis and Partial Differential Equations seminar
- School of Physical Sciences
Note that ex-directory lists are not shown. |
## Other listsQueens' Graduate Talks Computer Laboratory Programming Research Group Seminar DPMMS PhD student colloquium## Other talksEnergy and matter at the origin of life High strain rate deformation response of titanium for aerospace gas turbines Cognitive Ageing TBA Dr Megan MacLeod: Regulation of CD4 T cell retention and function at inflamed sites Vectors of Empire: mosquitoes in British India and beyond, 1900-1940 |