# OpenFOAM guide/Explicit equation

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Explicit equations are those whose dependent variables rely on the values of one another from a *previous* time. In other words, the dependent can be solved *individually*, without an *iterative method*.

OpenFOAM's fvc namespace defines a group of explicit operations.

Explicit methods have a more stringent timestep size restriction than implicit methods, but their accuracy is greater. Therefore they are preferable for transient problems.

See also: