Definition of the orthonormality of a funciton
在数学中，函数的正交规范性是用来描述一组函数具有两个关键特性：正交性（Orthogonality）和规范性（Normality）的术语：
If \(y_{i}(x),y_{j}(x)\) are "orthonormal" if \(\left\langle y_{i}(x),y_{j}(x)\right\rangle_{w;(a,b)}=\delta_{ij}\equiv\left\{\begin{aligned}&1 & &i=j \cr&0 & &i\neq j\end{aligned}\right.\)
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