つぎは,\( C_2 \) である。
ここではつぎのようにする:
\[
\partial_2 f_{1} = e_{1} + e_{5} + e_{7} \\
\partial_2 f_{2} = e_{2} + e_{6} + e_{8} \\
\partial_2 f_{3} = e_{3} + e_{4} + e_{9} \\
\partial_2 f_{4} = e_{4} + e_{10} + e_{7} \\
\partial_2 f_{5} = e_{5} + e_{11} + e_{8} \\
\partial_2 f_{6} = e_{6} + e_{12} + e_{9} \\
\partial_2 f_{7} = e_{10} + e_{14} + e_{16} \\
\partial_2 f_{8} = e_{11} + e_{15} + e_{17} \\
\partial_2 f_{9} = e_{12} + e_{13} + e_{18} \\
\partial_2 f_{10} = e_{13} + e_{19} + e_{16} \\
\partial_2 f_{11} = e_{14} + e_{20} + e_{17} \\
\partial_2 f_{12} = e_{15} + e_{21} + e_{18} \\
\partial_2 f_{13} = e_{19} + e_{23} + e_{25} \\
\partial_2 f_{14} = e_{20} + e_{24} + e_{26} \\
\partial_2 f_{15} = e_{21} + e_{22} + e_{27} \\
\partial_2 f_{16} = e_{22} + e_{1} + e_{25} \\
\partial_2 f_{17} = e_{23} + e_{2} + e_{26} \\
\partial_2 f_{18} = e_{24} + e_{3} + e_{27} \\
\]
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