The '''complex residue''' of a complex function ''f''(''z'') is the coefficient of the <math>1 \over z</math> term in ''f''(''z'')'s [[Laurent series]] expansion. | The '''complex residue''' of a complex function ''f''(''z'') is the coefficient of the <math>1 \over z</math> term in ''f''(''z'')'s [[Laurent series]] expansion. |