Talk:Exponential integral

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There's something wrong with the final statement on the page. It reads

E_n(x) = \int_1^\infty \frac{e^{-xt}}{t}\, dt.

The left-hand side depends on 'n', but the right-hand side is independent of 'n'. The wolfram's site http://mathworld.wolfram.com/En-Function.html suggests this:

E_n(x) = \int_1^\infty \frac{e^{-xt}}{t^n}\, dt.

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