Title: A missing p-adic L-function
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Abstract: Attached to any modular form f that is not ordinary at p one can
construct two p-adic L-functions.  However, when f is ordinary at p the
standard constructions yield only one p-adic L-function.  Where is this
other L-function?  In this talk, we will use overconvergent modular
symbols to construct the p-adic L-function attached to the evil twin of an
ordinary form.  
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Given an elliptic curve and a supersingular prime p one can 
attach two p-adic L-functions