I'm tring to solve the Indefinite Integral of the function: fx[zf_] := Log[1.9607843137254901` (0.42` + 0.09000000000000008` (0.11030501767281171` \ E^(-0.06294157608695654` (-0.38964705882352935` + zf)^2) + 1/2 Erfc[0.250881597744746` (-0.38964705882352935` + zf)] - 1/2 E^(0.0981` zf) (1.0382243764705883` + 0.0981` zf) Erfc[ 0.250881597744746` (0.38964705882352935` + zf)]))] When I try to solve the integral: Integrate[fx[zf], zf] Mathematica do not give any result. The only assumptyon needed is that zf must be >= 0. Login To add answer/comment