Abstract
The minimal time function with constant dynamics is studied in the context of a Hilbert space. A general formula for the subgradient is proven, and assumptions are identified in which the minimal time function is lower C2.
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Colombo, G., Wolenski, P.R. The subgradient formula for the minimal time function in the case of constant dynamics in Hilbert space. Journal of Global Optimization 28, 269–282 (2004). https://doi.org/10.1023/B:JOGO.0000026460.10505.dd
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DOI: https://doi.org/10.1023/B:JOGO.0000026460.10505.dd