Orthogonal system of function

Japanese: 直交関数系 - ちょっこうかんすうけい(英語表記)orthogonal system of function
Orthogonal system of function
Let the sequence of functions defined in the interval [-π, π] be 1, cos x , sin x , cos 2 x , sin 2 x , ..., cos nx , sin nx , .... Any two of these functions are orthogonal to each other. In this way, in a sequence of functions { f ( x )} defined in a certain interval [ a , b ], when any two of these are orthogonal, they are called an orthogonal system of functions in [ a , b ], or simply an orthogonal system.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
区間 [-π,π] で定義された関数列を1, cos x , sin x , cos 2x , sin 2x ,…, cos nx , sin nx ,…とする。これらの関数は,どの2つをとっても,互いに直交している。このように,ある定まった区間 [ab] で定義された関数列 {f(x)} において,これらのうちの任意の2つが直交しているとき,それらは [ab] における直交関数系,あるいは単に直交系と呼ばれる。

出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報

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