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Definition of the orthogonality of a function 在数学中，函数的正交性是用来描述一组函数具有的一种关键关系，这种关系意味着这组函数在某种意义上是互相独立的。 在函数空间中，两个函数\(f_{i}(x),f_{j}(x)\)被称为正交的，如果它们的内积为零：\(\left\langle f_{i}(x),f_{j}(x)\right\rangle=0\)
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