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I'd like to read some papers concerning fundamental groups, for example, papers written to explain some basic facts about homotopy explicitly for undergraduate students.

All the papers I have requires many background knowledge (homology, for example) but I'd a paper for young students.

I know that there are many good books but usually in books we find the theory explained in a row, or in the order just to read and follow. I'd like to start some research on a low level .

Suggestions are welcome. Best wishes.

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    The fundamental group has been a basic tool in the topologist's kit for over a century. All modern research presupposes familiarity with it. If you want to read research papers where the fundamental group is explained, you might consider looking up Poincare's original series of papers introducing it (discussed here: http://www.map.mpim-bonn.mpg.de/Poincar%C3%A9%E2%80%99s_homology_sphere).2012-12-11

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