Abstract
Graph burning is a discrete-time process on graphs, where vertices are sequentially burned, and burned vertices cause their neighbours to burn over time. We consider extremal properties of this process in the new setting where the underlying graph is also changing at each time-step. The main focus is on the possible densities of burning vertices when the sequence of underlying graphs are growing grids in the Cartesian plane, centred at the origin. If the grids are of height and width \(2cn+1\) at time n, then all values in \(\left[ \frac{1}{2c^2} , 1 \right] \) are possible densities for the burned set. For faster growing grids, we show that there is a threshold behaviour: if the size of the grids at time n is \(\omega (n^{3/2})\), then the density of burned vertices is always 0, while if the grid sizes are \(\varTheta (n^{3/2})\), then positive densities are possible. Some extensions to lattices of arbitrary but fixed dimension are also considered.
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The authors would like to thank the referee for their very careful reading of the paper and the many helpful suggestions which greatly improved a number of the proofs.
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AB and KG supported by NSERC Discovery grants.
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Bonato, A., Gunderson, K. & Shaw, A. Burning the Plane. Graphs and Combinatorics 36, 1311–1335 (2020). https://doi.org/10.1007/s00373-020-02182-9
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DOI: https://doi.org/10.1007/s00373-020-02182-9