# Basic Equations

The continuum mechanics summarized here is based on References. ^{1}
^{2}
^{3}

- Mesh description
- Kinematic description, that is, how the deformation is measured
- Kinetic description, that is, how the stresses are measured

Usually, the kinematic description implies the kinetic description as kinetic and kinematic measures should be energetically conjugated.

- Spatial or Eulerian coordinates
- Material or Lagrangian coordinates

^{1}Belytschko T. and Hughes T.J.R., “Computational Methods for Transient Analysis”, North-Holland, 1983.

^{2}Belytschko T., Wing Kam Liu, and Moran B., “Finite Elements for Nonlinear Continua and Structures”, John Wiley, 1999.

^{3}Geradin M., “Structural Dynamics ”, Masson, 1993.