an encyclopedia of finite element definitions

an encyclopedia of finite element definitions

- \(R\) is the reference tetrahedron. The following numbering of the subentities of the reference is used:
- \(\mathcal{V}\) is spanned by: \(1\), \(x\), \(y\), \(z\)
- \(\mathcal{L}=\{l_0,...,l_{3}\}\)
- Functionals and basis functions:

\(\displaystyle l_{0}:v\mapsto v(0,0,0)\)

\(\displaystyle \phi_{0} = - x - y - z + 1\)

This DOF is associated with vertex 0 of the reference element.

\(\displaystyle \phi_{0} = - x - y - z + 1\)

This DOF is associated with vertex 0 of the reference element.

\(\displaystyle l_{1}:v\mapsto v(1,0,0)\)

\(\displaystyle \phi_{1} = x\)

This DOF is associated with vertex 1 of the reference element.

\(\displaystyle \phi_{1} = x\)

This DOF is associated with vertex 1 of the reference element.

\(\displaystyle l_{2}:v\mapsto v(0,1,0)\)

\(\displaystyle \phi_{2} = y\)

This DOF is associated with vertex 2 of the reference element.

\(\displaystyle \phi_{2} = y\)

This DOF is associated with vertex 2 of the reference element.

\(\displaystyle l_{3}:v\mapsto v(0,0,1)\)

\(\displaystyle \phi_{3} = z\)

This DOF is associated with vertex 3 of the reference element.

\(\displaystyle \phi_{3} = z\)

This DOF is associated with vertex 3 of the reference element.