Definition:Exponential Integral Function/Formulation 1
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Definition
The exponential integral function is the real function $E_1: \R_{>0} \to \R$ defined as:
- $\map {E_1} x = \ds \int_{t \mathop = x}^{t \mathop \to +\infty} \frac {e^{-t} } t \rd t$
Also see
- Results about the exponential integral function can be found here.
Sources
- 1965: Murray R. Spiegel: Theory and Problems of Laplace Transforms ... (previous) ... (next): Chapter $1$: The Laplace Transform: Some Special Functions: $\text {VI}$. The Exponential integral