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第五百五十五章 巴拿赫定理(泛函数)(1 / 1)

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在苏格兰咖啡馆,巴拿赫跟哈恩在讨论数学问题。他们常用这种方式研究数学,提到精彩地方的时候,还要用笔记下来。

巴拿赫对哈恩说:“向量上的有界线性算子可以扩展到整个空间。”

哈恩说:“有界线性算子,指的是次线性空间吗?是不是仅此于线性空间的这个东西?”

巴拿赫说:“是的次线性空间,就是不线性。线性就是过原点的一条直线,而次线性的是个凸曲线而已。”

哈恩说:“那这个作用是什么?”

巴拿赫说:“说明了存在“足够”的连续线性泛函,定义在每一个赋范向量空间,使对偶空间的研究变得有趣味。”

哈恩说:“对偶空间是是行向量1×n与列向量n×1的关系的抽象化吗?”

巴拿赫说:“是的。这个结构能够在无限维度空间进行并为测度,分布及希尔伯特空间提供重要的观点。对偶空间的应用是泛函分析理论的特征。傅立叶变换亦内蕴对偶空间的概念。”

哈恩说:“我知道这个等价超曲面分割不相交的凸形。”

这些记录本就产生了一部传奇式的书:‘苏格兰书’.由于提问者当时或后来都很着名,使得这些记录具有重要的科学与历史价值,而且具有一种引起人们求知欲望的力量.由于巴拿赫夫人的功劳,这些‘苏格兰书’免遭战火,奇迹般地保存了下来”.此书后来由E.马尔采夫斯基(Marczewski)和斯泰因豪斯负责编辑出版.原稿由巴拿赫的儿子(一位博士)献给了巴拿赫国际数学中心。

喜欢数学心请大家收藏:数学心本站更新速度全网最快。

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