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On positive integers, (a*b=\gcd(a,b)) is defined. Does this operation have an identity element?

Answer and explanation

Correct answer: No, there is no universal identity in positive integers

Step 1: If (e) is the identity, then (\gcd(a,e)=a) for every positive integer (a). Step 2: Such an (e) would need to be a multiple of every positive integer, which no finite positive integer can be. Step 3: Pay attention to the set; if (0) were included, the conclusion could change.

Related tags

Binary OperationsGcdIdentityPositive IntegersRelations And FunctionsMathematicsClass 12 Mcq

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