feat: finite sums of differentiable maps into abelian Lie groups are differentiable #9768
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- separate main definitions and results - refer to multiplicative Lie group instance (units of normed algebra) - clarify terminology 'additive Lie group', not 'Lie additive group'
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Closing in favour of #9775, which avoid all the git history complications. |
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From sphere-eversion; I'm just upstreaming this.