What is the space resulting from the identification (x,y) ~ (x+2piR, y+2piR)? How is it different from the space resulting from(adsbygoogle = window.adsbygoogle || []).push({});

(x,y) ~ (x+2piR, y)

(x,y) ~ (x, y+2piR), which is a two-dimensional torus (a donut)

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# Identification question

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