An **Abelian variety** is a fundamental concept in algebraic geometry and is defined as a projective algebraic variety that has the structure of a group variety. More formally, an Abelian variety can be described as follows: 1. **Projective Variety**: It is a complex manifold that can be embedded in projective space \(\mathbb{P}^n\) for some integer \(n\). This means it can be described in terms of polynomial equations.
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An abelian variety is a complete connected group variety. Despite its name, commutativity follows from completeness and the rigidity lemma.