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The relations among the notions of various kinds of stability and their applications

  • Tiexin Guo,
  • Xiaohuan Mu,
  • Qiang Tu

摘要

First, we prove that a random metric space can be isometrically embedded into a complete random normed module, as an application it is easy to see that the notion of d- \(\sigma \) σ -stability in a random metric space can be regarded as a special case of the notion of \(\sigma \) σ -stability in a random normed module; as another application we give the final version of the characterization for a d- \(\sigma \) σ -stable random metric space to be stably compact. Second, we prove that an \(L^{p}\) L p -normed \(L^{\infty }\) L -module is exactly generated by a complete random normed module so that the gluing property of an \(L^{p}\) L p -normed \(L^{\infty }\) L -module can be derived from the \(\sigma \) σ -stability of the generating random normed module, as applications the direct relation between module duals and random conjugate spaces are given. Third, we prove that a random normed space is order complete iff it is \((\varepsilon ,\lambda )\) ( ε , λ ) -complete, as an application it is proved that the d-decomposability of an order complete random normed space is exactly its d- \(\sigma \) σ -stability. Finally, we prove that an equivalence relation on the product space of a nonempty set X and a complete Boolean algebra B is regular iff it can be induced by a B-valued Boolean metric on X, as an application it is proved that a nonempty subset of a Boolean set (Xd) is universally complete iff it is a B-stable set defined by a regular equivalence relation.