BEST MONOTONE L_■-APPROXIMATIONS IN SEVERAL VARIABLES |
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引用本文: | Miguel Iturrieta,Felipe Zó.BEST MONOTONE L_■-APPROXIMATIONS IN SEVERAL VARIABLES[J].分析论及其应用,1998,14(3):1-10. |
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作者姓名: | Miguel Iturrieta Felipe Zó |
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作者单位: | Universidad Nac.del Comahue Argentina,Conicet and Univ.Nac.de San Luis,Argentina |
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摘 要: | Given a continuous function f defined on the unit cube of R~n and a convexfunction _t,_t(0)-0,_t(x)>0,for x>0,we prove that the set ofbest L~(t)-approximations by monotone functions has exactly one elementft,which is also a continuous function.Moreover if the family of convexfunctions {_t}t>0 converges uniformly on compact sets to a function _0,then the best approximation f_t→f_0 uniformly,as t→0,where fo is thebest approximation of f within the Orlicz space L~(0) The best approxima-tions{f_t}are obtained as well as minimizing integrals or the Luxemburgnorm
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