Sara Chan writes "The Internet remains connected on a global scale even if a randomly chosen 99% of its connection points break down. It is, however, in danger if its most highly connected points are selectively knocked out. Recent computer simulations have shown that the Internet is fairly resilient because it is scale free. The latest work, published in Physical Review Letters strengthens this conclusion. Two independent groups of researchers applied percolation theory. Percolation theory deals with systems containing points ("sites") and connections between them, and it analyzes the behavior of the system when some of the sites or connections are removed (it was developed by geophysicists for estimating how much oil could be extracted from reservoirs in a porous medium). Abstracts of the papers are available here and here."
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