2.1 Basic equations
  2.1.1 A comment on adiabatic heating
  2.1.2 Boundary conditions
  2.1.3 Two-dimensional models
  2.1.4 Comments on the final set of equations
 2.2 Coefficients
 2.3 Dimensional or non-dimensionalized equations?
 2.4 Static or dynamic pressure?
 2.5 Pressure normalization
 2.6 Initial conditions and the adiabatic pressure/temperature
 2.7 Compositional fields
 2.8 Constitutive laws
 2.9 Numerical methods
 2.10 Approximate equations
  2.10.1 The anelastic liquid approximation (ALA)
  2.10.2 The truncated anelastic liquid approximation (TALA)
  2.10.3 The Boussinesq approximation (BA)
  2.10.4 The isothermal compression approximation (ICA)
 2.11 Choosing a formulation in ASPECT
  2.11.1 Mass conservation approximation
  2.11.2 Temperature equation approximation
  2.11.3 Approximation of the buoyancy term
  2.11.4 Reference state: The adiabatic profile
  2.11.5 Combined formulations
 2.12 Free surface calculations
  2.12.1 Arbitrary Lagrangian-Eulerian implementation
  2.12.2 Free surface stabilization
 2.13 Calculations with melt transport
 2.14 Nullspace removal
 2.15 Particles