We make some remarks concerning the p-semiconvex hulls of the quasiconformal sets, using a recent significant observation of T. Iwaniec ["Nonlinear Cauchy-Riemann operators in Rn", Trans. Am. Math. Soc. 354 (2002) 1961–1995] on the important relation between the regularity of quasiregular mappings in the theory of geometric functions and the notion of Morrey's quasiconvexity in the calculus of variations. We also point out several partial results on a conjecture in that paper

Contact details are reproduced from the original publication and may be historical.

Baisheng Yan

Dept. of Mathematics, Michigan State University, East Lansing, MI 48824, U.S.A.

  1. J.-J. Alibert, B. Dacorogna: An example of a quasiconvex function that is not polyconvex in two dimensions, Arch. Rational Mech. Anal. 117 (1992) 155–166.https://doi.org/10.1007/BF00387763Google Scholar
  2. K. Astala: Analytic aspects of quasiconformality, Doc. Math., Extra Volume ICM 1998, Vol. II, 617–626.https://doi.org/10.4171/dms/1-2/59Google Scholar
  3. J. M. Ball: Convexity conditions and existence theorems in nonlinear elasticity, Arch. Rational Mech. Anal. 63 (1977) 337–403.https://doi.org/10.1007/BF00279992Google Scholar
  4. D. Burkholder: Sharp inequalities for martingales and stochastic integrals, Astérisque 157-158 (1988) 75–94.Google Scholar
  5. B. Dacorogna: Direct Methods in the Calculus of Variations, Springer-Verlag, New York, 1989.https://doi.org/10.1007/978-3-642-51440-1Google Scholar
  6. T. Iwaniec: p-Harmonic tensors and quasiregular mappings, Ann. Math. 136 (1992) 589–624.https://doi.org/10.2307/2946602Google Scholar
  7. T. Iwaniec: An approach to Cauchy-Riemann operators in Rn, preprint.Google Scholar
  8. T. Iwaniec, A. Lutoborski: Integral estimates for null Lagrangians, Arch. Rational Mech. Anal. 125 (1993) 25–79.https://doi.org/10.1007/BF00411477Google Scholar
  9. T. Iwaniec, G. Martin: Quasiregular mappings in even dimensions, Acta Math. 170 (1993) 29–81.https://doi.org/10.1007/BF02392454Google Scholar
  10. T. Iwaniec, C. Sbordone: Weak minima of variational integrals, J. Reine Angew. Math. 454 (1994) 143–161.https://doi.org/10.1515/crll.1994.454.143Google Scholar
  11. C. B. Morrey, Jr.: Quasiconvexity and the lower semicontinuity of multiple integrals, Pacific J. Math. 2 (1952) 25–53.https://doi.org/10.2140/pjm.1952.2.25Google Scholar
  12. S. Müller: Variational Models for Microstructure and Phase Transitions, Lecture Notes, Max-Planck-Inst. Math. in Sciences, Leipzig, 1998.https://doi.org/10.1007/BFb0092670Google Scholar
  13. S. Müller, V. Šverák, B. Yan: Sharp stability results for almost conformal maps in even dimensions, Journ. Geom. Analysis 9(4) (1999) 671–681.https://doi.org/10.1007/BF02921978Google Scholar
  14. Yu. G. Reshetnyak: Space Mappings with Bounded Distortion, Transl. Math. Mono., Amer. Math. Soc. 73, 1989.https://doi.org/10.1090/mmono/073Google Scholar
  15. V. Šverák: Rank-one convexity does not imply quasiconvexity, Proc. Roy. Soc. Edinburgh 120A (1992) 185–189.https://doi.org/10.1017/S0308210500015080Google Scholar
  16. V. Šverák: Lower semicontinuity for variational integral functionals and compensated compactness, In: Proceedings of the International Congress of Mathematicians, Zürich, 1994, 1153–1158, (S. D. Chatterji, ed.), Birkhäuser, Basel, 1995.https://doi.org/10.1007/978-3-0348-9078-6_108Google Scholar
  17. B. Yan: Remarks about W 1,p -stability of the conformal set in higher dimensions, Ann. Inst. H. Poincaré, Analyse Non Linéaire 13(6) (1996) 691–705.https://doi.org/10.1016/s0294-1449(16)30119-6Google Scholar
  18. B. Yan: On rank-one convex and polyconvex conformal energy functions with slow growth, Proc. Roy. Soc. Edinburgh 127A (1997) 651–663.https://doi.org/10.1017/S0308210500029954Google Scholar
  19. B. Yan, Z. Zhou: Stability of weakly almost conformal mappings, Proc. Amer. Math. Soc. 126 (1998) 481–489.https://doi.org/10.1090/S0002-9939-98-04079-9Google Scholar
  20. B. Yan, Z. Zhou: Lp -mean coercivity, regularity and relaxation in the calculus of variations, to appear in Nonlinear Analysis.Google Scholar
  21. K. Zhang: On various semiconvex hulls in the calculus of variations, Calc. Var. Partial Differential Equations 6 (1998) 143–160.https://doi.org/10.1007/s005260050086Google Scholar

B. Yan. “Semiconvex Hulls of Quasiconformal Sets.” Journal of Convex Analysis 8 (2001), No. 1, 269–278. https://doi.org/10.68381/jca08013