cosh_integral( z )

The hyperbolic cosine integral of z in SageMath. Alias of Chi. Defined by

\[ \operatorname{Chi} (z) = \gamma + \ln(z) + \int_0^z du \: \frac{ \cosh(u) - 1 }{ u } \]

where γ is euler_gamma.

Plot on the real axis:

Series expansion about root:

Special values:

Related functions:   Chi

Function category: exponential integrals sagemath-docs