Banach limit in convexity and geometric means for convex bodies

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2016, 23: 41-51. doi: 10.3934/era.2016.23.005

Banach limit in convexity and geometric means for convex bodies

Liran Rotem ^1,

1.	University of Minnesota, School of Mathematics, United States

Received August 2016 Revised October 2016 Published November 2016

Abstract
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In this note we construct Banach limits on the class of sequences of convex bodies. Surprisingly, the construction uses the recently introduced geometric mean of convex bodies. In the opposite direction, we explain how Banach limits can be used to construct a new variant of the geometric mean that has some desirable properties.

Keywords: geometric mean, Banach limit., Convex bodies.

Mathematics Subject Classification: 52A20, 46A2.

Citation: Liran Rotem. Banach limit in convexity and geometric means for convex bodies. Electronic Research Announcements, 2016, 23: 41-51. doi: 10.3934/era.2016.23.005

References:

[1]	S. Artstein-Avidan and V. Milman, The concept of duality for measure projections of convex bodies, J. Funct. Anal., 254 (2008), 2648-2666. doi: 10.1016/j.jfa.2007.11.008.
[2]	K. J. Böröczky and R. Schneider, A characterization of the duality mapping for convex bodies, Geom. Funct. Anal., 18 (2008), 657-667. doi: 10.1007/s00039-008-0676-5.
[3]	P. M. Gruber, The endomorphisms of the lattice of norms in finite dimensions, Abh. Math. Sem. Univ. Hamburg, 62 (1992), 179-189. doi: 10.1007/BF02941625.
[4]	J. Lawson and Y. Lim, The geometric mean, matrices, metrics, and more, Amer. Math. Monthly, 108 (2001), 797-812. doi: 10.2307/2695553.
[5]	P. D. Lax, Functional Analysis, Pure and Applied Mathematics (New York), Wiley-Interscience [John Wiley & Sons], New York, 2002.
[6]	V. Milman and L. Rotem, Non-standard constructions in convex geometry; geometric means of convex bodies,, in Convexity, ().
[7]	I. Molchanov, Continued fractions built from convex sets and convex functions, Commun. Contemp. Math., 17 (2015), 1550003, 18 pp. doi: 10.1142/S0219199715500030.
[8]	L. Rotem, Algebraically inspired results on convex functions and bodies, Commun. Contemp. Math., 18 (2016), 1650027, 14 pp. doi: 10.1142/S0219199716500279.
[9]	R. Schneider, Convex Bodies: The Brunn-Minkowski Theory, Second expanded edition, Encyclopedia of Mathematics and its Applications, 151, Cambridge University Press, Cambridge, 2014.

show all references

References:

[1]	S. Artstein-Avidan and V. Milman, The concept of duality for measure projections of convex bodies, J. Funct. Anal., 254 (2008), 2648-2666. doi: 10.1016/j.jfa.2007.11.008.
[2]	K. J. Böröczky and R. Schneider, A characterization of the duality mapping for convex bodies, Geom. Funct. Anal., 18 (2008), 657-667. doi: 10.1007/s00039-008-0676-5.
[3]	P. M. Gruber, The endomorphisms of the lattice of norms in finite dimensions, Abh. Math. Sem. Univ. Hamburg, 62 (1992), 179-189. doi: 10.1007/BF02941625.
[4]	J. Lawson and Y. Lim, The geometric mean, matrices, metrics, and more, Amer. Math. Monthly, 108 (2001), 797-812. doi: 10.2307/2695553.
[5]	P. D. Lax, Functional Analysis, Pure and Applied Mathematics (New York), Wiley-Interscience [John Wiley & Sons], New York, 2002.
[6]	V. Milman and L. Rotem, Non-standard constructions in convex geometry; geometric means of convex bodies,, in Convexity, ().
[7]	I. Molchanov, Continued fractions built from convex sets and convex functions, Commun. Contemp. Math., 17 (2015), 1550003, 18 pp. doi: 10.1142/S0219199715500030.
[8]	L. Rotem, Algebraically inspired results on convex functions and bodies, Commun. Contemp. Math., 18 (2016), 1650027, 14 pp. doi: 10.1142/S0219199716500279.
[9]	R. Schneider, Convex Bodies: The Brunn-Minkowski Theory, Second expanded edition, Encyclopedia of Mathematics and its Applications, 151, Cambridge University Press, Cambridge, 2014.

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