We have the following groups: G: ℝ+ under multiplication H: ℝ under addition we check if log: G→H is isomorphic, first we check homomorphism: log(xy)=log(x)+log(y) by laws of logarithm, next we check if log is bijective, this is where Im stuck, how do I check for bijection in groups? please if able explain step by step in detail, thank you in advance

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Chapter2: Second-order Linear Odes
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We have the following groups:

G: ℝ+ under multiplication

H: ℝ under addition

we check if log: G→H is isomorphic, first we check homomorphism: log(xy)=log(x)+log(y) by laws of logarithm, next we check if log is bijective, this is where Im stuck, how do I check for bijection in groups? please if able explain step by step in detail, thank you in advance.

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