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Questions by pinky31

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general preparation advice
Everyone says that if one is serious for GATE, solving standard book questions is important. I am reading the concepts and solving GATE questions but I am not able to follow any strategy for standard book questions. Any advice would be appreciated.
Everyone says that if one is serious for GATE, solving standard book questions is important.I am reading the concepts and solving GATE questions but I am not able to foll...
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1 answer
2
Kenneth Rosen
Let (A,*) be a semigroup. Furthermore let there be an element a in A such that for every x in A there exists u and v in A satisfying the relation- a*u=v*a=x. Prove that there is an identity element in A
Let (A,*) be a semigroup. Furthermore let there be an element a in A such that for every x in A there exists u and v in A satisfying the relation-a*u=v*a=x.Prove that the...