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A note on the engulfing property and the -regularity of convex functions in Carnot groups
Authors:
Luca Capogna and Diego Maldonado
Journal:
Proc. Amer. Math. Soc. 134 (2006), 3191-3199
MSC (2000):
Primary 35Hxx, 52A30
Posted:
May 9, 2006
MathSciNet review:
2231902
Full-text PDF Free Access
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Abstract: We study the engulfing property for convex functions in Carnot groups. As an application we show that the horizontal gradient of functions with this property is Hölder continuous.
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and oscillatory integrals, Princeton Mathematical Series,
vol. 43, Princeton University Press, Princeton, NJ, 1993. With the
assistance of Timothy S. Murphy; Monographs in Harmonic Analysis, III. MR 1232192
(95c:42002)
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- L. A. Caffarelli, Interior a priori estimates for solutions of fully non-linear equations, Ann. Math., 130 (1989), 189-213. MR 1005611 (90i:35046)
- 2.
- L. A. Caffarelli, Interior
estimates for solutions of the Monge-Ampère equation, Ann. Math. 131 (1990), 135-150. MR 1038360 (91f:35059)
- 3.
- L. A. Caffarelli, Some regularity properties of solutions of Monge-Ampère equation, Comm. Pure Appl. Math. 44 (1991), 965-969. MR 1127042 (92h:35088)
- 4.
- D. Danielli, N. Garofalo & D.-M. Nhieu, Notions of convexity in Carnot groups, Comm. Anal. Geom. 11 (2003), no. 2, 263-341. MR 2014879 (2004m:22014)
- 5.
- D. Danielli, N. Garofalo & D.-M. Nhieu, On the best possible character of the
norm in some a priori estimates for non-divergence form equations in Carnot groups, Proc. Amer. Math. Soc. 131 (2003), no. 11, 3487-3498. MR 1991760 (2004i:35051)
- 6.
- D. Danielli, N. Garofalo, D.-M. Nhieu & F. Tournier, The theorem of Busemann-Feller-Alexandrov in Carnot groups, Comm. Anal. Geom. 12 (2004), no. 4, 853-886.MR 2104079 (2005j:22005)
- 7.
- G. Folland, Subelliptic estimates and function spaces on nilpotent Lie groups, Ark. Math. 13 (1975), 161-207. MR 0494315 (58:13215)
- 8.
- G. B. Folland & E. M. Stein, Estimates for the
complex and analysis on the Heisenberg group, Comm. Pure Appl. Math. 27 (1974), 459-522. MR 0367477 (51:3719)
- 9.
- G.B. Folland & E.M. Stein, Hardy Spaces on Homogeneous Groups, Princeton Univ. Press., (1982). MR 0657581 (84h:43027)
- 10.
- L. Forzani & D. Maldonado, Doubling measures, quasi-symmetric mappings, and a class of convex functions on the real line, submitted.
- 11.
- L. Forzani & D. Maldonado, On geometric characterizations for Monge-Ampère doubling measures, J. Math. Anal. Appl. 275(2) (2002), 721-732.MR 1943775 (2003k:35066)
- 12.
- L. Forzani & D. Maldonado, Properties of the solutions to the Monge-Ampère equation, Nonlinear Anal. 57(5-6) (2004), 815-829. MR 2067735 (2005c:35095)
- 13.
- N. Garofalo and D.-M. Nhieu, Isoperimetric and Sobolev inequalities for Carnot-Carathéodory spaces and the existence of minimal surfaces, Comm. Pure Appl. Math. 49 (1996), 1081-1144. MR 1404326 (97i:58032)
- 14.
- N. Garofalo & F. Tournier, Subelliptic estimates for fully nonlinear equations in the Heisenberg group, to appear in Trans. Amer. Math. Soc.
- 15.
- C. Gutiérrez, The Monge-Ampère equation. Progress in Nonlinear Differential Equations and their Applications, 44. Birkhäuser Boston, Inc., Boston, MA, 2001. MR 1829162 (2002e:35075)
- 16.
- C. Gutiérrez & Q. Huang, Geometric properties of the sections of solutions to the Monge-Ampère equation, Trans. Amer. Math. Soc. 352(9) (2000), 4381-4396. MR 1665332 (2000m:35060)
- 17.
- C. Gutiérrez & A. Montanari, On the second order derivatives of convex functions on the Heisenberg group, Ann. Sc. Norm. Super. Pisa Cl. Sci. (5) 3 (2004), no. 2, 349-366. MR 2075987 (2005f:26038)
- 18.
- C. Gutiérrez & A. Montanari, Maximum and comparison principles for convex functions on the Heisenberg group, Comm. Partial Differential Equations 29 (2004), no. 9-10, 1305-1334. MR 2103838 (2005h:35024)
- 19.
- H. Hörmander, Hypoelliptic second-order differential equations, Acta Math. 119 (1967), 147-171. MR 0222474 (36:5526)
- 20.
- S. Krantz, Structure and interpolation theorems for certain Lipschitz spaces and estimates for the
equation, Duke Math. J. 43 (1976), no. 2, 417-439. MR 0430311 (55:3316)
- 21.
- S. Krantz, Geometric Lipschitz spaces and applications to complex function theory and nilpotent groups, J. Funct. Anal. 34 (1979), no. 3, 456-471.MR 0556266 (81j:32020)
- 22.
- G. Lu, J. Manfredi & B. Stroffolini, Convex functions on the Heisenberg group, Calc. Var. Partial Differential Equations 19 (2004), no. 1, 1-22.MR 2027845 (2004m:35088)
- 23.
- A. Nagel, E.M. Stein & S. Wainger, Balls and metrics defined by vector fields I: basic properties, Acta Math. 155 (1985), 103-147.MR 0793239 (86k:46049)
- 24.
- P. Pansu, Métriques de Carnot-Carathéodory et quasisométries des espaces symmetriques de rang un, Ann. Math. 129, (1989), 1-60. MR 0979599 (90e:53058)
- 25.
- E. M. Stein, Harmonic analysis: real-variable methods, orthogonality, and oscillatory integrals, Princeton University Press 43 (1993).MR 1232192 (95c:42002)
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Additional Information
Luca Capogna
Affiliation:
Department of Mathematics, University of Arkansas, Fayetteville, Arkansas 72701
Email:
lcapogna@comp.uark.edu
Diego Maldonado
Affiliation:
Department of Mathematics, University of Kansas, Lawrence, Kansas 66045
Address at time of publication:
Department of Mathematics, University of Maryland, College Park, Maryland 20742
Email:
maldonado@math.ku.edu, maldona@math.umd.edu
DOI:
http://dx.doi.org/10.1090/S0002-9939-06-08359-6
PII:
S 0002-9939(06)08359-6
Keywords:
Carnot groups,
convexity,
Monge-Amp\'ere equation
Received by editor(s):
May 9, 2005
Posted:
May 9, 2006
Additional Notes:
The first author was partially supported by the NSF Faculty Early Career Award DMS 0134318
Communicated by:
Michael T. Lacey
Article copyright:
© Copyright 2006 American Mathematical Society
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