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The class group pairing and <i>p</i> -descent on elliptic curves

The class group pairing and <i>p</i> -descent on elliptic curves

We give explicit formulae for the logarithmic class group pairing on an elliptic curve defined over a number field. Then we relate it to the descent relative to a suitable cyclic isogeny. This allows us to connect the resulting Selmer group with the logarithmic class group of the base. These …