## Documentation Center |

As described in Types of PDE Problems You Can Solve, Partial Differential Equation Toolbox™ can
solve systems of PDEs. This means you can have *N* coupled
PDEs, with coupled boundary conditions. The solvers such as `assempde` and `hyperbolic` can
solve systems of PDEs with any number *N* of components.

Scalar PDEs are those with *N* = 1, meaning just
one PDE. Systems of PDEs generally means *N* > 1. The documentation
sometimes refers to systems as multidimensional PDEs or as PDEs with
vector solution *u*.

In all cases, PDE systems have a single 2-D geometry and mesh.
It is only *N*, the number of equations, that can
vary.

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