 Mixed finite element method

The Mixed Finite Element Method (MFEM) is an extension of the standard finite element method (FEM) that allows for the simultaneous approximation of multiple variables, often with different types of equations or fields. This method is particularly useful in problems where the physical phenomena being modeled can be described by both scalar and vector quantities, or where certain variables are more conveniently expressed as functions that are not directly compatible with the usual finite element framework.