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| 1 | wakaba | 1.1 | [1] [[環]] [CODE(math)[[VAR[R]]]] が[DFN[可換環]]であるとは: |
| 2 | - [CODE(math)[(∀[VAR[a]], [VAR[b]] ∈ [VAR[R]]) [VAR[a]][VAR[b]] = [VAR[b]][VAR[a]]]] | ||
| 3 | ([[積]]に関する[[交換法則]]) | ||
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