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Published online by Cambridge University Press: 20 November 2018
In a paper by LaSalle [l] on linear time optimal control the following lemma is proved:
Let Ω be the set of all r-dimensional vector functions U(τ) measurable on [ 0, t] with |ui(τ)≦1. Let Ωo be the subset of functions uo(τ) with |uo i(τ) = 1. Let Y(τ) be any (n × r ) matrix function in L1([ 0, t]).