Some geometric properties of typical compact convex sets in Hilbert spaces
de Blasi, F.
Studia Mathematica, Tome 133 (1999), p. 143-162 / Harvested from The Polish Digital Mathematics Library

An investigation is carried out of the compact convex sets X in an infinite-dimensional separable Hilbert space , for which the metric antiprojection qX(e) from e to X has fixed cardinality n+1 (n arbitrary) for every e in a dense subset of . A similar study is performed in the case of the metric projection pX(e) from e to X where X is a compact subset of .

Publié le : 1999-01-01
EUDML-ID : urn:eudml:doc:216647
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de Blasi, F. Some geometric properties of typical compact convex sets in Hilbert spaces. Studia Mathematica, Tome 133 (1999) pp. 143-162. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-smv135i2p143bwm/

[00000] [1] E. Asplund, Farthest points in reflexive locally uniformly rotund Banach spaces, Israel J. Math. 4 (1966), 213-216. | Zbl 0143.34904

[00001] [2] K. Bartke und H. Berens, Eine Beschreibung der Nichteindeutigkeitsmenge für die beste Approximation in der Euklidischen Ebene, J. Approx. Theory 47 (1986), 54-74. | Zbl 0619.41020

[00002] [3] H. F. Bohnenblust and S. Karlin, Geometrical properties of the unit sphere of Banach algebras, Ann. of Math. 62 (1955), 217-229. | Zbl 0067.35002

[00003] [4] J. M. Borwein and S. Fitzpatrick, Existence of nearest points in Banach spaces, Canad. J. Math. 41 (1989), 702-720. | Zbl 0668.46006

[00004] [5] L. E. J. Brouwer, Beweis der Invarianz der Dimensionenzahl, Math. Ann. 70 (1911), 161-165. | Zbl 42.0416.02

[00005] [6] F. S. De Blasi, On typical compact convex sets in Hilbert spaces, Serdica 23 (1997), 255-268. | Zbl 0976.46010

[00006] [7] F. S. De Blasi and T. Zamfirescu, Cardinality of the metric projection on compact sets in Hilbert space, Math. Proc. Cambridge Philos. Soc. 126 (1999), 37-44. | Zbl 0923.46022

[00007] [8] R. De Ville and V. E. Zizler, Farthest points in w*-compact sets, Bull. Austral. Math. Soc. 38 (1988), 433-439. | Zbl 0656.46012

[00008] [9] A. L. Dontchev and T. Zolezzi, Well-Posed Optimization Problems, Lecture Notes in Math. 1543, Springer, Berlin, 1993. | Zbl 0797.49001

[00009] [10] M. Edelstein, Furthest points of sets in uniformly convex Banach spaces, Israel J. Math. 4 (1966), 171-176. | Zbl 0151.17601

[00010] [11] P. M. Gruber, Die meisten konvexen Körper sind glatt, aber nicht zu glatt, Math. Ann. 229 (1977), 259-266. | Zbl 0342.52009

[00011] [12] P. M. Gruber, A typical convex surface contains no closed geodesics, J. Reine Angew. Math. 416 (1991), 195-205. | Zbl 0718.52003

[00012] [13] P. M. Gruber, Baire categories in geometry, in: Handbook of Convex Geometry, P. M. Gruber and J. M. Wills (eds.), North-Holland, Amsterdam, 1993, 1327-1346. | Zbl 0791.52002

[00013] [14] V. Klee, Some new results on smoothness and rotundity in normed linear spaces, Math. Ann. 139 (1959), 51-63. | Zbl 0092.11602

[00014] [15] K. S. Lau, Farthest points in weakly compact sets, Israel J. Math. 22 (1975), 168-174. | Zbl 0325.46022

[00015] [16] C. Miranda, Un'osservazione su un teorema di Brouwer, Boll. Un. Mat. Ital. II 3 (1941), 5-7.

[00016] [17] J. C. Oxtoby, Measure and Category, Grad. Texts in Math. 2, Springer, New York, 1971.

[00017] [18] E. T. Poulsen, Convex sets with dense extreme points, Amer. Math. Monthly 66 (1959), 577-578. | Zbl 0104.08401

[00018] [19] R. Schneider, On the curvature of convex bodies, Math. Ann. 240 (1979), 177-181. | Zbl 0379.52004

[00019] [20] R. Schneider and J. A. Wieacker, Approximation of convex bodies by polytopes, Bull. London Math. Soc. 13 (1981), 149-156. | Zbl 0421.52005

[00020] [21] I. Singer, Best Approximation in Normed Linear Spaces by Elements of Linear Subspaces, Grundlehren Math. Wiss. 171, Springer, New York, 1970. | Zbl 0197.38601

[00021] [22] S. B. Stečkin [S. B. Stechkin], Approximation properties of sets in normed linear spaces, Rev. Math. Pures Appl. 8 (1963), 5-18 (in Russian).

[00022] [23] J. A. Wieacker, The convex hull of a typical compact set, Math. Ann. 282 (1988), 637-644. | Zbl 0636.52004

[00023] [24] T. Zamfirescu, Nearly all convex bodies are smooth and strictly convex, Monatsh. Math. 103 (1987), 57-62. | Zbl 0607.52002

[00024] [25] T. Zamfirescu, The nearest point mapping is single valued nearly everywhere, Arch. Math. (Basel) 54 (1990), 563-566. | Zbl 0715.54013

[00025] [26] T. Zamfirescu, Baire categories in convexity, Atti Sem. Mat. Fis. Univ. Modena 39 (1991), 139-164. | Zbl 0780.52003

[00026] [27] N. V. Zhivkov, Compacta with dense ambiguous loci of metric projection and antiprojection, Proc. Amer. Math. Soc. 123 (1995), 3403-3411. | Zbl 0842.41024

[00027] [28] N. V. Zhivkov, Densely two-valued metric projections in uniformly convex Banach spaces, Set-Valued Anal. 3 (1995), 195-209. | Zbl 0830.41028