Let $E$ be an elliptic curve defined over a number field $K$. The **obstruction class** of $E$ is an ideal class of $K$ which is trivial if and only if $E$ has a global minimal model.

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- Last edited by John Jones on 2018-06-19 18:44:17

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- 2018-06-19 18:44:17 by John Jones (Reviewed)