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Elliptic Curves. Modular Interpretations of X(2,4). Among others, I love the following story: when (a, b, c) = (1/2,1/2,1), the ratio Ul(X) : uz(x) of linearly independent solutions defines a multi-valued map D}, its monodromy group is f(2) = {g E SL(2, Z) 1 g == 12 mod 2}, the map.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.