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Is there a textbook in topology with a copyleft license?

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    $\begingroup$ math.cornell.edu/~hatcher $\endgroup$
    – Carlo Beenakker
    Commented Dec 14, 2016 at 20:03
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    $\begingroup$ @CarloBeenakker it is not an intro to topology, also it is free but not copyleft. $\endgroup$
    – Anton Petrunin
    Commented Dec 14, 2016 at 20:06
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    $\begingroup$ @AntonPetrunin This is probably what Carlo Beenakker was referring to. It is still probably not under copyleft, but it is an intro to (point-set) topology. $\endgroup$
    – Denis Nardin
    Commented Dec 14, 2016 at 21:59
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    $\begingroup$ @AntonPetrunin: maybe you can edit with what you mean by intro to topology? Not just how little, but also how much. For example, the first three chapters of Hatcher's Intro Notes can also be found in many textbooks introducing analysis; presumably you want more than just that. (I note also that you tagged at.algebraic-topology on the question.) $\endgroup$
    – Willie Wong
    Commented Dec 14, 2016 at 21:59
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    $\begingroup$ There isn't one, not in English. But it sounds like an interesting project for someone to seed. $\endgroup$
    – David Snyder
    Commented Dec 15, 2016 at 3:31

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