division ring
plural of balun
(informal) To fiddle idly. / (informal) To joke, kid, or play. / (informal) To have a sexual relationship, especially one which is non-commital.
Alternative form of Cenozoic
(algebra) A ring with 0 ≠ 1, such that every non-zero element a has a multiplicative inverse, meaning an element x with ax = xa = 1.
研究者は、有限で0 ≠ 1かつ零でない任意の元が乗法逆元を持つ環が実際には体（すなわち可換である）であることを証明した。
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