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I would like to understand Grothendieck's Esquisse d'un Programme more. Are there any references that would help me, and are there modern works pursuing the same themes?

At this point I am still currently learning algebraic geometry, but I am familiar with the idea of moduli spaces as parametrizing families of curves (or more general objects) as well as the fundamental group from algebraic topology. I would like to know more as to what I should study next if I am interested in the ideas presented in the Esquisse d'un Programme.

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    $\begingroup$ Look here: cambridge.org/us/academic/subjects/mathematics/number-theory/… $\endgroup$ – KConrad Feb 5 '16 at 4:22
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    $\begingroup$ As Esquisse has several distinct threads it would help if you gave more precision on what parts you want to concentrate on. $\endgroup$ – Tim Porter Feb 5 '16 at 11:26
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    $\begingroup$ I think that this MO question about Grothendieck's Dessins d'Enfants could be of interest to you: mathoverflow.net/questions/1909/what-are-dessins-denfants You may begin with this part of his Esquisse. $\endgroup$ – Pedro Montero Feb 5 '16 at 12:01
  • $\begingroup$ Thanks for all your responses! If I had to be specific I guess I find the second and third sections to be the most interesting, which I believe concerns moduli and Teichmuller spaces, the projective line with three points removed, and the already mentioned Dessins d'Enfants. I will certainly check out the links provided. And I hope it's okay to add this question here, but what does Grothendieck mean by "modular multiplicities"? Is he referring to stacks? $\endgroup$ – Anton Hilado Feb 5 '16 at 13:11

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