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In this example, <math>H</math> and <math>G</math> are equivalent, <math>H\equiv G</math>, and the duals are strongly isomorphic: <math>H^*\cong G^*</math>.
In this example, <math>H</math> and <math>G</math> are equivalent, <math>H\equiv G</math>, and the duals are strongly isomorphic: <math>H^*\cong G^*</math>.
考虑超图<math>H</math>，他的边为：
考虑超图<math>H</math>，他的边为：