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- W2162212860 abstract "Let G be a connected Lie group with Lie algebra g, exp G : g ! G the exponential map and E(G) its range. E n (G) will denote the set of all n-fold products of elements of E(G). G is called exponential if E(G) = E 1 (G) = G. Since most real (or complex) connected Lie groups are not exponential, it is of interest to know that the weaker conclusion E 2 (G) = G is always true (Theorem 5.6). This result will be applied to prove Theorem 6.4, a generalized version of Floquet-Lyapunov theory for Lie groups. It will then be seen the property that a Lie group is exponential is equivalent to the existence of a special form of Floquet-Lyapunov theory for it (Corollary 6.3). Theorem 2.8, generalizes the well-known fact that connected nilpotent Lie groups are exponential. Our methods also provide alternative proofs of some known results by arguments which seem simpler and more natural than the usual ones. Among these is part of the classical Dixmier-Saito result, Theorem 5.8. The method employed here stems from the earliest techniques of Lie theory. It exploits connections between the exponential map and dierential equations on G, starting from the observation that the one parameter subgroup g(t) = expG(t ) corresponding to an element 2 g satises the dierential equations g 0 (t) = dLg(t) and g 0 (t) = dRg(t) on G with the initial condition g(0) = eG . More generally here it will be neces- sary to consider dierential equations corresponding to certain time dependent vector elds on G, or equivalently, certain time dependent cross-sections of the tangent bundle of G." @default.
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- W2162212860 date "2003-01-01" @default.
- W2162212860 modified "2023-09-27" @default.
- W2162212860 title "The Exponential Map and Dierential Equations on Real Lie Groups" @default.
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