Abstract
The upper and lower directional derivates of the value function of a differential game are shown to satisfy certain relationships. These relationships imply that the value is a viscosity solution of the Isaacs equation.
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Communicated by W. Fleming
This research was performed under NSF Grant No. DMS-8500353.
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Berkovitz, L.D. Characterizations of the values of differential games. Appl Math Optim 17, 177–183 (1988). https://doi.org/10.1007/BF01448365
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DOI: https://doi.org/10.1007/BF01448365