An elliptic curve \(E\) defined over a number field \(K\) is said to have **non-split multiplicative reduction** at a prime \(\mathfrak{p}\) of \(K\) if the reduction of \(E\) modulo \(\mathfrak{p}\) has a nodal singularity with tangent slopes *not* defined over the residue field at \(\mathfrak{p}\).

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- Last edited by John Jones on 2018-06-19 18:53:58

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- 2018-06-19 18:53:58 by John Jones (Reviewed)