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Vijay posted an Question
September 20, 2020 • 18:56 pm 30 points
  • IIT JAM
  • Mathematics (MA)

Check whether a group or not?

Check whether a group or not? what is it then monoid, semigroup, etc?

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    Piyush pachauri

    Identity element is not unique. Associativity holds.

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    Piyush pachauri best-answer

    No. Look at the identity element , it does not exist.

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    if it was for +R or -R then we can say it has an identity element. am I right?

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    Yes , then you can say , it exists as it is unique.

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