Comparison between Certain Equivalent Norms Regarding Some Familiar Properties Implying WFPP

نویسندگان

  • Helga Fetter
  • Berta Gamboa de Buen
چکیده

Dowling et al. in 1 defined a norm in l1 which was used by Lin 2 to exhibit an equivalent norm which makes l1 into a space with the fixed point property FPP . A similar norm can be defined in every Banach spaceX with a basis. Since l1 with its usual norm does not have FPP, we asked ourselves if this norm in these spaces would also improve properties that imply the weak fixed point property WFPP . We found out that in some instances it does, in some cases the original norm has better properties, and in some cases you cannot compare them. We give several examples to illustrate our assertions.

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عنوان ژورنال:
  • Int. J. Math. Mathematical Sciences

دوره 2011  شماره 

صفحات  -

تاریخ انتشار 2011