Hello, I am not exactly sure how to go about proving a a Field with given properties is a field.(adsbygoogle = window.adsbygoogle || []).push({});

Any help would be appreciated. At least a push in the right direction/

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

http://www.upload.mn/view/q77nuboss6set86gbhfs.jpg [Broken]

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Prove F is a field where F maps to itself

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