Diametrically complete sets in Minkowski spaces
نویسندگان
چکیده
We obtain a new characterization of the diametrically complete sets in Minkowski spaces, by modifying two well-known characteristic properties of bodies of constant width. We also get sharp inequalities for the circumradius and inradius of a diametrically complete set of given diameter. Strengthening former work of D. Yost, we show that in a generic Minkowski space of dimension at least three the set of diametrically complete sets is not closed under the operation of adding a ball. We conclude with new results about Eggleston’s problem of characterizing the Minkowski spaces in which every diametrically complete set is of constant width. 2010 Mathematics Subject Classification. 52A21, 46B20.
منابع مشابه
Structure of the Space of Diametrically Complete Sets in a Minkowski Space
We study the structure of the space of diametrically complete sets in a finite dimensional normed space. In contrast to the Euclidean case, this space is in general not convex. We show that its starshapedness is equivalent to the completeness of the parallel bodies of complete sets, a property studied in [13], which is generically not satisfied. The space in question is, however, always contrac...
متن کاملLocal Lipschitz Continuity of the Diametric Completion Mapping
The diametric completion mapping associates with every closed bounded set C in a normed linear space the set γ(C) of its completions, that is, of the diametrically complete sets containing C and having the same diameter. We prove local Lipschitz continuity of this set-valued mapping, with respect to two possible arguments: either as a function on the space of closed, bounded and convex sets, wh...
متن کاملSome geometry of convex bodies in C(K) spaces
We deal with some problems related to vector addition and diametric completion procedures of convex bodies in C(K) spaces. We prove that each of the following properties of convex bodies in C(K) characterizes the underlying compact Hausdorff space K as a Stonean space: (i) C(K) has a generating unit ball; (ii) all Maehara sets in C(K) are complete; (iii) the set Dd of all complete sets of diame...
متن کاملGeneral Minkowski type and related inequalities for seminormed fuzzy integrals
Minkowski type inequalities for the seminormed fuzzy integrals on abstract spaces are studied in a rather general form. Also related inequalities to Minkowski type inequality for the seminormed fuzzy integrals on abstract spaces are studied. Several examples are given to illustrate the validity of theorems. Some results on Chebyshev and Minkowski type inequalities are obtained.
متن کاملCardinalities of k-distance sets in Minkowski spaces
A subset of a metric space is a k-distance set if there are exactly k non-zero distances occuring between points. We conjecture that a k-distance set in a d-dimensional Banach space (or Minkowski space), contains at most (k+1) points, with equality iff the unit ball is a parallelotope. We solve this conjecture in the affirmative for all 2-dimensional spaces and for spaces where the unit ball is...
متن کامل