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### Malcev Lie algebra and associated graded Lie algebra

Suppose $L$ is a nilpotent finite-dimensional Lie algebra over $\mathbb{Q}$ of class $c$. We can define an associated graded Lie algebra to $L$ that, as a vector space, is:
$$\bigoplus_{i=1}^c ...

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### About $G$-modules versus $Lie(G)$-modules for algebraic groups

Hello,
I would like to know clear references about the following facts:
Let $G$ be a connected algebraic group (over alg. closed field in char. 0), $Lie(G)$ its Lie algebra, $M$ a $G$-module. I ...

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### Does there exist a complex Lie group G such that …

... every Riemann surface of genus $1$ appears as a complex one-parameter subgroup of $G$?