On a Theorem of Pitt

On a Theorem of Pitt
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关于皮特定理

DOI:
10.1112/jlms/s2-7.2.376
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发表时间:
1973
期刊:
影响因子:
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通讯作者:
T. M. Flett
T. M. Flett
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文献类型:
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作者:
T. M. Flett

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我们立即假设对于某个y, Xf (y)< 0;由于n {x e x:\f (x)\= 00}= 0,这特别意味着Xf (y)- >0 = y- >0。递减的重排off,用/*表示,是区间[0,00]上的函数[由f*(t)= inf {y>: AyCy)<*},/> 0给出。
We suppose immediately that Xf (y)< oo for some y; since n {x e X:\f (x)\= 00}= 0, this implies in particular that Xf (y)-> 0 as y-> 00. The decreasing rearrangement off, denoted by/*, is the function on the interval] 0, 00 [given by f*(t)= inf {y> 0: AyCy)<*},/> 0.