In summary, we have defined the following terms from the analysis of finite-difference schemes for the linear shift-invariant case with constant sampling rates:

- PDE
*well posed*PDE at least marginally stable - FDS
*consistent*FDS shift operator PDE operator as - FDS
*stable*stable or marginally stable as a digital filter - FDS
*strictly stable*stable as a digital filter - FDS
*marginally stable*marginally stable as a digital filter

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