Fermi–Dirac Integral (other)
Fermi–Dirac integral may refer to: * Complete Fermi–Dirac integral * Incomplete Fermi–Dirac integral In mathematics, the incomplete Fermi– Dirac integral for an index ''j'' is given by :F_j(x,b) = \frac \int_b^\infty \frac\,dt. This is an alternate definition of the incomplete polylogarithm. See also * Complete Fermi–Dirac integral E ...

Complete Fermi–Dirac Integral
In mathematics, the complete Fermi–Dirac integral, named after Enrico Fermi and Paul Dirac, for an index ''j '' is defined by :F_j(x) = \frac \int_0^\infty \frac\,dt, \qquad (j > -1) This equals :-\operatorname_(-e^x), where \operatorname_(z) is the polylogarithm. Its derivative is :\frac = F_(x) , and this derivative relationship is used to define the Fermi-Dirac integral for nonpositive indices ''j''. Differing notation for F_j appears in the literature, for instance some authors omit the factor 1/\Gamma(j+1). The definition used here matches that in thNIST DLMF Special values The closed form of the function exists for ''j'' = 0: :F_0(x) = \ln(1+\exp(x)). For ''x = 0'', the result reduces to F_j(0) = \eta(j+1), where \eta is the Dirichlet eta function. See also * Incomplete Fermi–Dirac integral * Gamma function * Polylogarithm In mathematics, the polylogarithm (also known as Jonquière's function, for Alfred Jonquière) is a special func ...
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