| body | --uriencoded--$$ \normalsize \begin%7Bcases%7D N_0(u,v) = 0.25 u (u-1) v (v-1) \\ N_1(u,v) = 0.25 u (u+1) v (v-1) \\ N_2(u,v) = 0.25 u (u+1) v (v+1) \\ N_3(u,v) = 0.25 u (u-1) v (v+1) \\ N_4(u,v) = 0.5 (1-u%5e2) v (v-1) \\ N_5(u,v) = 0.5 (1-v%5e2) u (u+1) \\ N_6(u,v) = 0.5 (1-u%5e2) v (v+1) \\ N_7(u,v) = 0.5 (1-v%5e2) u (u-1) \\ N_8(u,v) = (1-v%5e2) (1-u%5e2) \\ \end%7Bcases%7D \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad (6) $$ |
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