Maths Goes Underground

摘要

With the 50th anniversary of the IMA less than a year away, it is good to celebrate another anniversary this year, namely the 150th anniversary of the London Underground. I suspect that just about every member of the IMA has at some point travelled on an Underground train. The first such train (which was gas lit and powered by steam) travelled on the Metropolitan line on 10 January 1863. Since then the London Underground has grown considerably in size, and thé network consists of 270 stations joined by 249 miles of track. It has inspired other metro systems all over the world.