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<math>V_n^{(2)} = \left \{ij \ : \ 1 \leq j \leq n, i \neq j \right \} \subset V^{(2)}, \qquad i=1, \cdots, n.</math>
<math>V_n^{(2)} = \left \{ij \ : \ 1 \leq j \leq n, i \neq j \right \} \subset V^{(2)}, \qquad i=1, \cdots, n.</math>
<math>V_n^{(2)}=\left\{ij\:\1\leq j\leq n，i \neq j \right\}\子集 V^{(2)}，\qquad i=1，\cdots，n.</math>
<math>V_n^{(2)}=\left\{ij\:\1\leq j\leq n,i \neq j \right\}\子集 V^{(2)},\qquad i=1,\cdots,n.</math>