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

On this page Zwiebach says that "It is a known fact about lattices that the torus C-hat contains I copies of each point on the unit torus".

I am confused about what this means and what this has to do with lattices. Any compact, 2-dimensional region in a plane contains the same number of points as any other compact 2-dimensional region in the plane since you can find a bijection between the two. So what is Zwiebach really saying here?

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Zwiebach page 299

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