[代數] 環的例子
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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