(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I am having trouble understanding how I would go about finding all subgroups of index 2 inR*, the multiplicative group of nonzero real numbers. Any hints will be greatly appreciated.

2. Relevant equations

3. The attempt at a solution

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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# Abstract Algebra - Subgroups of index 2 in R*

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