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Degree 1 Lagrange on a tetrahedron
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- \(R\) 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.