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innovation in a socially desirable substitute. Evolutionary theory emphasizes the possibility of innovation waves associated with … products. It does appear, however, that dominant designs did have substantial positive innovation effects. More specifically … innovation effects at the firm level than among individual inventors"--National Bureau of Economic Research web site …
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In this paper we introduce the problem of shunting passenger train units in a railway station. Shunting occurs whenever train units are temporarily not necessary to operate a given timetable. We discuss several aspects of this problem and focus on two subproblems. We propose mathematical models...
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