Abstract
This line is (in a sense we explain below) the tangent to the circle at its identity element 1. And, in fact, any Lie group has a linear space (of the same dimension as the group) as its tangent space at the identity.
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© 2008 Springer Science+Business Media, LLC
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Stillwell, J. (2008). The exponential map. In: Naive Lie Theory. Undergraduate Texts in Mathematics. Springer, New York, NY. https://doi.org/10.1007/978-0-387-78214-0_4
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DOI: https://doi.org/10.1007/978-0-387-78214-0_4
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