FeynHelpers manual (development version)

PaXLn

PaXLn corresponds to Ln in Package-X.

See also

Overview.

Examples

(*Just to load Package-X*)
  PaXEvaluate[A0[1]];

PaXLn uses X`Ln for numerical evaluations

PaXLn[-4.5, 1]

1.50408+3.14159i1.50408\, +3.14159 i

X`Ln[-4.5, 1]

1.50408+3.14159i1.50408\, +3.14159 i

The same goes for derivatives and series expansions

D[PaXLn[x, \[Alpha]], x]

1x\frac{1}{x}

Series[PaXLn[x, \[Alpha]], {x, 1, 2}]

log(1+iαϵ)+(x1)12(x1)2+O((x1)3)\log (1+i \alpha \epsilon )+(x-1)-\frac{1}{2} (x-1)^2+O\left((x-1)^3\right)