Aequationes Mathematicae ( IF 0.9 ) Pub Date : 2020-10-26 , DOI: 10.1007/s00010-020-00761-y Yu Zhou , Zihou Zhang , Chunyan Liu
Let X (resp. Y) be a real Banach space such that the set of all \(w^*\)-exposed points of the closed unit ball \(B(X^*)\) (resp. \(B(Y^*)\)) is \(w^*\)-dense in the unit sphere \(S(X^*)\) (resp. \(S(Y^*)\)), (cc(X), H) (resp. (cc(Y), H)) be the metric space of all nonempty compact convex subsets of X (resp. Y) endowed with the Hausdorff distance H, and \(f:(cc(X),H)\rightarrow (cc(Y),H)\) be a standard bijective \(\varepsilon \)-isometry. Then there is a standard surjective isometry \(g:cc(X)\rightarrow cc(Y)\) satisfying that \((1)\, g|_{X}\) (the restriction of g on \(\{\{u\}, u\in X\}\)) is a surjective linear isometry from \(\{\{u\},u\in X\}\) onto \(\{\{v\},v\in Y\}\) and \(g(A)=\cup _{a\in A}g|_{X}(\{a\})\) for any \(A\in cc(X)\); \((2)\, H(f(A),g(A))\le 3\varepsilon \) for any \(A\in cc(X)\).
中文翻译:
紧凸子集的Hausdorff度量空间之间的双射$$ \ varepsilon $$ε-对称的Hyers-Ulam稳定性
令X(分别为Y)是一个实际的Banach空间,使得闭合单位球\(B(X ^ *)\)的所有\(w ^ * \)暴露点的集合(分别为\(B( Y ^ *)\))是\(w ^ * \)-单位球体内的密度\(S(X ^ *)\)(分别是\(S(Y ^ *)\)),(cc(X), ħ)(RESP(CC(Ý), ħ))是所有非空紧凸子集的度量空间X(分别ÿ赋予Hausdorff距离)ħ,和\(F:(CC(X) ,H)\ rightarrow(cc(Y),H)\)是标准双射\(\ varepsilon \)等轴测图。然后有一个标准的射影等距\(g:cc(X)\ rightarrow cc(Y)\)满足\((1)\,g | _ {X} \)(g在\ {\ { \ {u \},u \ in X \} \))是从\(\ {\ {u \},u \ in X \} \)到\(\ {\ {v \}, v \ in Y \} \)和\(g(A)= \ cup _ {a \ in A} g | _ {X}(\ {a \})\)对于任何\(A \ in cc(X )\) ; \((2)\,H(f(A),g(A))\ le 3 \ varepsilon \)对于任何\(A \ cc(X)\)。