Paper 3, Section II, I
Part II, 2012
Let be the lattice the torus , and the Weierstrass elliptic function with respect to .
(i) Let be the point given by . Determine the group
(ii) Show that defines a degree 4 holomorphic map , which is invariant under the action of , that is, for any and any . Identify a ramification point of distinct from which is fixed by every element of .
[If you use the Monodromy theorem, then you should state it correctly. You may use the fact that , and may assume without proof standard facts about .]