inner product of functions

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inner product of functions

for tow functions f and g sampling by interval Δx, the inner product may be defined as

<f,g>=limx0f(xi)g(xi)Δx=f(x)g(x)dx

The expectation of function

let f(x)>0andf(x)dx=1, so then the expectation is:

E[g(x)]=f(x)g(x)dx=<f,g>

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