Compute triangle edge-shape functions
Compute triangle edge-shape functionsfunctions vanish on upper two edges
x,y: coordinates in triangle (-1, 0), (1, 0), (0, 1)
f_i-2 (x, 0) = IntegratedLegendrePol_i (x)
f_i-2 ... pol of order i, max order = n
Monomial extension:
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