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I can not think of any example of a definable group in algebraically closed fields?

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    When you say definable, can you specify the language and theory? I assume that you mean language of rings and the theory is ACF, but the more you write the better answers you might get.2012-03-21

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Algebraic groups are the most relevant examples that are definable over alegebraically closed fields. So you can take $\mathrm{GL}(\mathfrak{n},\mathbb{C})$ can serve as an example.

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    @DavidSpeyer : Thanks a lot for your comment sir.2012-03-21