2020/12/01 by Alberto Bressan, Bressan, Alberto, Maria Teresa Chiri +1 · 1 citation
Mathematics · #34A60 #49J24 #49Q20 #93B03 #Analysis of PDEs (math.AP) #Classical Analysis and ODEs (math.CA) #FOS: Mathematics #Optimization and Control (math.OC) #math.AP #math.CA #math.OC #msc:34A60 #msc:49J24 #msc:49Q20 #msc:93B03
paper · pdf · doi:10.48550/arxiv.2012.00799
46 pages, 16 figure
arxiv created 2020/12/01 · arxiv updated 2020/12/03
The paper studies a dynamic blocking problem, motivated by a model of optimal fire confinement. While the fire can expand with unit speed in all directions, barriers are constructed in real time. An optimal strategy is sought, minimizing the total value of the burned region, plus a construction cost. It is well known that optimal barriers exists. In general, they are a countable union of compact, connected, rectifiable sets. The main result of the present paper shows that optimal barriers are nowhere dense. The proof relies on new estimates on the reachable sets and on optimal trajectories for the fire, solving a minimum time problem in the presence of obstacles.