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RingHi . How I prove this ? : If R a ring with 1. Prove that in R ? anny suggestions ? |

Re: RingQuote:
(-1)(-1) - 1 = (-1)(-1) + (-1) = (-1)(-1) + (-1)1 = (-1)(-1 + 1) by the distributive law = (-1)0 = 0 so (-1)(-1) = 1 |

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