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2 2 g x d x 10, Solving Large Scale Nonlinear by a New Numerical Method, $\int_{-\infty}^{\infty}f(x)\overline {g(x)}dx = \frac{1}{2\pi}\int_{-\infty}^{\infty} \hat{f}(\mu)\overline{\hat{g}(\mu)}d\mu.$ - Mathematics Stack Exchange