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A variety defined over a field $F$ is irreducible if it cannot be decomposed as the union of two varieties over $F$. It is geometrically irreducible if it remains irreducible when seen as a variety over the algebraic closure of $F$.

Knowl status:
  • Review status: reviewed
  • Last edited by Andrew Sutherland on 2019-05-12 10:00:30
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