Calculation programs 1 Energy expression 1 FLAC 3D 1 Failure (mechanical) 1 Fast Lagrangian analysis of continuum 1 Heterogeneous slopes 1 Inhomogeneous slope 1 Open source software 1 Ordinary differential equations 1 Slope failure 1 Slope stability 1 Strength reduction method 1 Variational energies 1 Variational methods 1 inhomogeneous slopes stability 1 variational method 1