This field is likely both ugly and useless.
OK, in 2D they've achieved some cute rational number results. But still.
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Percolation theory studies random subgraphs formed by independently or dependently declaring vertices or edges open.
Percolation theory is a mathematical concept originally developed in the context of physics and materials science to study the behavior of connected clusters in a random medium. It explores how the properties of such clusters change as the density of the medium is varied. The theory has applications in various fields, including physics, chemistry, computer science, biology, and even social sciences.