Roelfszema, Majken (2018) Finite groups of automorphisms on genus one curves without rational points. Master's Thesis / Essay, Mathematics.

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Abstract
Mazur’s theorem concerning rational torsion points on elliptic curves over Q (the rationals) can be reformulated as follows. Given is a genus one curve X over Q. Let σ and τ be involutions in the automorphism group over Q of X, Aut(X), and suppose the group G ⊂ Aut(X) generated by σ and τ is finite. Then G is a dihedral group of order 2n, with n ∈ {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12}. Examples where X = E is an elliptic curve over Q are relatively easy to construct. The aim of this thesis is for each possible n to find curves X where X(Q) = ∅. In order to visualize the situation, the context of Poncelet figures is used. A Poncelet figure containing an ngon can be made using X exactly when Aut(X) has such a subgroup G of order 2n.
Item Type:  Thesis (Master's Thesis / Essay) 

Supervisor name:  Top, J. 
Degree programme:  Mathematics 
Thesis type:  Master's Thesis / Essay 
Language:  English 
Date Deposited:  13 Jul 2018 
Last Modified:  20 Jul 2018 12:25 
URI:  http://fse.studenttheses.ub.rug.nl/id/eprint/17862 
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