- **Abstract Algebra**
(*http://mymathforum.com/abstract-algebra/*)

- - **Ring**
(*http://mymathforum.com/abstract-algebra/39134-ring.html*)

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 |

All times are GMT -8. The time now is 06:00 AM. |

Copyright © 2019 My Math Forum. All rights reserved.