The Birch and Swinnerton-Dyer conjecture relates the rank of
an elliptic curve (and other arithmetic information) to the
order of vanishing (and the first nonzero coefficient)
of the associated -function at the critical point.
Thus, results and conjectures about the critical values of varios
families of -function will give information about the
ranks of elliptic curves.
(more details and some good references are sought.)
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