A set B is called a Banach space if it satisfies the following three conditions: (1) Set B is a vector space over the real or complex numbers. (2) For each element x of set B , its norm ∥x∥ is defined. (3) For two elements x and y of set B , if the distance between x and y is defined as ∥x - y∥ , then set B is a complete metric space with respect to this distance. Initially, Hilbert spaces were discussed as function spaces, and it was thought that the discussion could be applied to more general function spaces as well. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
集合 B が次の3つの条件を満たすとき,これをバナッハ空間という。 (1) 集合 B は,実数または複素数体の上のベクトル空間である。 (2) 集合 B のおのおのの元 x に対して,そのノルム ∥x∥ が定義されている。 (3) 集合 B の2つの元 x と y に対して,x と y の間の距離を ∥x-y∥ で定義すれば,この距離に関して集合 B は完備な距離空間である。初め,関数空間としてのヒルベルト空間が論じられ,その議論がもっと一般の関数空間にも通用するように考えられた。
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