# Can someone help in how to approach reading Mordell-Weil Theorem for abelian varieties?

I was thinking to start reading the proof of Mordell-Weil Theorem for abelian varieties over number fields, after getting done with the proof in the case of elliptic curves over number field and I wasn't sure how to go on about it.

As of now, I am familiar with the basic Algebraic Geometry (classical, affine and projective varieties' theory included in the first introduction to the course, although I'll have to brush up on Riemann- Roch theorem quite a bit) and also the proof in case of Elliptic Curves over number fields using cohomological approach.

I've heard that the more generalized result in case of abelian varieties uses quite a bit of AG, so this post is to ask what kind of AG is needed to be able to read/understand the proof? Can someone recommend some references for it with possibly some reviews about them or maybe suggest a path that one should follow if they're interested in the proof?

• Did suggestions given in mathoverflow.net/questions/334366/… worked for you to read about Mordell-Weil Theorem for elliptic curves ?? Jul 25, 2019 at 13:47
• @abx The question/answer that you cite is definitely not an answer to this question. The proof of the Mordell-Weil theorem for elliptic curves can be done much more explicitly, and in a more elementary fashion, than for higher dimensional abelian varieties. There are a number of places to read the higher dimensional proof (Lang's Diophantine Geometry, Mumford's Abelian Varieites, ...), and a discussion of their respective merits would be good answers to this question, as would a discussion of the requisite background. Jul 25, 2019 at 14:04
• OK, sorry, I was too hasty. Voting to reopen.
– abx
Jul 25, 2019 at 14:40
• @Joe Silverman: How about your book 'Diophantine geometry'? I just found it, although it has all the necessary AG in an appendix, do you think someone with as little AG background as what I mentioned above, should be okay with reading it? (Of course,I'll also check out other references you mentioned as well, thanks for them btw) Jul 25, 2019 at 16:35
• The AG chapter in my book with Hindry is more of a "pre-pendix". In any case, you can try reading the proof of MW, referring back to the AG chapter as needed. Jul 25, 2019 at 18:37

As for the part using heights, it's again quite formal given the definition of an appropriate height functions, it requires the theorem of the cube and the fact that abelian varieties are projective. For example, see here: http://www.msri.org/attachments/workshops/301/HtSurveyMSRIJan06.pdf. In short, I would suggest learning about Abelian varieties by themselves (enough to understand why multiplication by $$n$$ is generically etale, why they are projective and on the way, the theorem of the cube). Then, you can figure out how to extend the classical Mordell-Weil to AVs using these tools.