http://ift.tt/2m73a7X The Boston subway is a complex system, spreading out from a focus at Park Street. On March 3rd, the Boylston shuttle went into service, tying together the seven principal lines, on four different levels. A day later, train 86 went missing on the Cambridge-Dorchester line. The Harvard algebraist R. Tupelo suggested the train might have hit a node, a singularity. By adding the Boylston shuttle, the connectivity of the subway system had become infiniteā¦ Never heard of this tragic incident? Time to read up on A.J. Deutsch ās classic āA subway named Moebiusā from 1950. A 12 page pdf of this short story is available via the Rio Rancho Math Camp . The āexplanationā given in the story is that the Moebius strip has a singularity. Before you yell that this is impossible, have a look at this or that . A ānon spatial networkā where āan exclusion principle operatesā, Deutschās story says. Hereās another take. The train took the exceptional fiber branch, instead ...
