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並前往http://www2.gcc.edu/dept/math/faculty/BancroftED/teaching/handouts/group_ring_definitions.pdf

Definitions Related to Groups and Rings

An integral domain (or simply domain) is a commutative ring (with unity) that has no zero divisors. Definition 9 (Unit). a ∈ R−{0R} is called a unit of a ring ...

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