Q.Let (R,+) be the additive group of real numbers and let (R,) + i i be the multiplicative group of positive real numbers, then mapping F: R R+ + → → defined by x f(x) e x R = ∀ ∈ = ∀ ∈ = ∀ ∈ = ∀ ∈ is.
Correct answer: An isomorphism
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