Definition of orthogonal function? Can we say that a single function f (x) is an orthogonal function? Does an orthogonal function refer to a group of functions?

Strictly speaking, a single function f (x) can not be said to be an orthogonal function. The concept of orthogonal function is defined on a function set, and the interval and direct product defined by the function set must be clearly specified. It determines a relationship between the elements in the set, It is also possible to say that a function is orthogonal

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