M1 Mathematics, 2011-2012
MM26E Numerical Approximation of PDEs
Hervé Le Dret
$P_1$-Lagrange approximation
The hat-functions of $P_1$-Lagrange approximation on a triangular mesh.
A hat-function corresponding to an internal node
The same seen from the top
A hat-function corresponding to a boundary node
Here is the $P_1$-interpolate of the function $(x_1,x_2)\mapsto \sin x_1\sin x_2$ on a triangular mesh on a square
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