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※ 編輯: Lheavens 來自: 140.115.213.226 (01/09 23:45)
推 ntnusliver :2Z x 2Z 01/12 19:12
What is a ring without unity and not commutative?
以下的正確嗎?
A commutative ring with out unity and not a integral domain→Zmod4's {0,2}
A commutative ring with unity and not a integral domain→Z_8
A ring with unity but not commutative→ M_2(Z) (2階矩陣 元素為整數)
A integral domain but not a field→Z
最上面那個問題想了又想找不到例子..拜託各位了
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