FeynCalc manual (development version)

OPEi

OPEi etc. are variables with DataType PositiveInteger which are used in functions relating to the operator product expansion.

See also

Overview, OPEj, OPEk, OPEl, OPEn, OPEo.

Examples

OPEi

i

DataType[OPEi, OPEj, OPEk, OPEl, OPEm, OPEn, OPEo, PositiveInteger]

\{\text{True},\text{True},\text{True},\text{True},\text{True},\text{True},\text{True}\}

PowerSimplify[{(-1)^(2 OPEi), (-1)^(2 OPEj), (-1)^(2 OPEk), (-1)^(2 OPEl), (-1)^(2 OPEm), (-1)^(2 OPEn), (-1)^(2 OPEo)}]

\{1,1,1,1,1,1,1\}

Re has been changed:

{Re[OPEi] > -3, Re[OPEi] > -2, Re[OPEi] > -1,   Re[OPEi] > 0, Re[OPEi] > 1}

\{\Re(i)>-3,\Re(i)>-2,\Re(i)>-1,\Re(i)>0,\Re(i)>1\}

{Re[-OPEi + OPEm] > 0, Re[-OPEi + OPEm] > 1, Re[-OPEi + OPEm] > 2}

\{\Re(m-i)>0,\Re(m-i)>1,\Re(m-i)>2\}

{Re[OPEm] > -3, Re[OPEm] > -2, Re[OPEm] > -1,   Re[OPEm] > 0, Re[OPEm] > 1}

\{\Re(m)>-3,\Re(m)>-2,\Re(m)>-1,\Re(m)>0,\Re(m)>1\}