On convexity properties of ?-direct sums ofBanachspaces

On convexity properties of ?-direct sums ofBanachspaces
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关于Banach空间的?-直和的凸性性质

DOI:
10.1016/j.jmaa.2003.09.011
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发表时间:
2003
影响因子:
1.3
通讯作者:
P. Dowling
P. Dowling
中科院分区:
数学3区
文献类型:
--
作者:
P. Dowling

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如果每个Banach空间都是严格凸的(分别是一致凸的,局部一致凸的,在每个方向上一致凸的),并且相应的Banach范数是严格凸的,则Banach空间的正和是严格凸的(分别是一致凸的,局部一致凸的,在每个方向上一致凸的)。
The ψ-direct sum of Banach spaces is strictly convex (respectively, uniformly convex, locally uniformly convex, uniformly convex in every direction) if each of the Banach spaces are strictly convex (respectively, uniformly convex, locally uniformly convex, uniformly convex in every direction) and the corresponding ψ-norm is strictly convex.