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Inner product for a function in R

当函数内积定义在实数域\(\mathbb{R}\)中时,函数内积为:\(\displaystyle\left\langle f(x), g(x)\right\rangle_{w(x),x\in(a,b)}:=\int^{x=b}_{x=a}f(x)g(x)w(x)dx\)

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