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I have to admit that I spent a while now thinking about the question below. I could see that the map f takes integers to integers keeping thus taking the vertices of $T^{2}$ to vertices of $R/Z$. I am thinking about Mayer vietoris but how no idea how to map $T^{2}$x$0$ to $T^{2}$x$1$ "in order to compute the homology of the quotient space"

Many thanks enter image description here

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    What is your question? What you quote is not a question, it's a definition (of $X$).2011-05-30
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    @Arturo. Thank you for your remark. I am supposed to compute the homology of the quotient space.2011-05-30
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    Could you please add that to the question to clarify it? It's also not clear to me whether you are having trouble conceptualizing what $X$ is, or just with computing the homology of $X$.2011-05-30
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    @Arturo I want to compute the homology .I would be grateful to you if you also could help me understand how f works on homology2011-05-30
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    please edit your question to that it becomes a question. Not in the comments: in the actual question.2011-05-30

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