... The main LanHEP features are: § LanHEP expands expression and combines similar terms ; § it performs the Fourier transformation by replacing derivatives with momenta of particles; § it writes Feynman rules in the form ... example for covariant derivative; § it is possible to define multiplets, and (if necessary) their components; § user can write Lagrangian terms with Lorentz and multiplet indices explicitly or omit indices (all or some of them); § ... It has one vector index. ...