Find an atlas and coordinates for a torus T^2 = S^1 X S^1

bjogae
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Homework Statement



Find an atlas and coordinates for a torus T^2 = S^1 X S

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The Attempt at a Solution



I know that an atlas on a manifold M is a collection of charts whose domains cover M, but i am not sure how to start this one mathematically.
 
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Do you know how to find an atlas on a cylinder? If so, just do that then imagine gluing the ends of the cylinder together... what do you get for your charts?
 
Actually, no, i don't. I get that a cylinder is S1 × [0, 1], and I think I know how to find the atlas on a circle, I just feel so lost on how to apply it on a cylinder.
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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