\( \boldsymbol{x}_{\pm}(u, v) = \begin{pmatrix} u \\ v \\ \pm \sqrt{1 - u^{2} - v^{2}} \end{pmatrix} \)

\( (u^{2} + v^{2} \leq 0.99) \)

\( a = \) , \( b = \) , \( c = \) 更新

\( (0.1 \leq a, b, c \leq 10) \)