Keyword : Landau

G01FTF	Landau inverse function $Ψ (x)$
G01MTF	Landau density function $ϕ (λ)$
G01PTF	Landau first moment function $Φ_{1} (x)$
G01QTF	Landau second moment function $Φ_{2} (x)$
G01RTF	Landau derivative function $ϕ^{'} (λ)$