Evaluete optimal edge-shape function.
Evaluete optimal edge-shape function.
on triangle (with coordinates (-1,0),(1,0),(0,1))
\varphi_i:=\frac{1}{y}\int_{x-y}^{x+y}C_{i-1}^{-1/2}(s)ds
$$
vanishes on other both edges
Computed by recurrence
$$
{\varphi}_i:=
p_n(x,y) = a_n p_{n-4}} + b_n x p_{n-3} + (c_n + d_n (x*x-y*y)) p_{n-2}} + e_n x p_{n-1}}
$$
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