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Letαbe a flow on a Banach algebra(?),and t(?)u_t a continuous function from Rt into the group of invertible elements of(?)such that u_sα_s(u_t)=u_s+t,s,t∈R.Thenβ_t=Adu_t oα_t,t∈R is also a flow on(?),where Adu_t(B)(?)u_tBu_t~(-1)for any B∈(?).βis said to