在泛函分析中有多个有名的定理冠以里斯表示定理（英語：Riesz representation theorem），它们是为了纪念匈牙利数学家弗里杰什·里斯。 此定理說明希尔伯特空间的連續線性泛函都可以表示成內積。 定理： H {\displaystyle H} 是個複希尔伯特空间（也就是标量是複數 ...

IT is well known that Dirichlet made a new start in the theory of numbers by bringing it into connection with certain analytical functions of the form??? being an integer, and s a h real quantity.

Covered topics include Banach and Hilbert spaces, Hahn-Banach theorem, dual spaces, orthonormal bases, measure spaces, Lebesgue integration, convergence theorems, Lp-spaces and their duals, ...