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Math Help - rings

  1. #1
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    rings

    assume R is a ring with unity e. Prove: if a is in R has a multiplicative inverse, the multiplicative inverse of a is unique.

    so if ax=xa=e is the multiplicative inverse, the to make it unique, how do you show that?
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  2. #2
    MHF Contributor Drexel28's Avatar
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    Quote Originally Posted by bookie88 View Post
    assume R is a ring with unity e. Prove: if a is in R has a multiplicative inverse, the multiplicative inverse of a is unique.

    so if ax=xa=e is the multiplicative inverse, the to make it unique, how do you show that?
    e=ee'=e'
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