Kevin Clift originally shared this post:
Subway Maps Converge Mathematically
There are mathematical similarities between subway/underground systems that have been allowed to grow in response to urban demand, even though they may not have been planned to be similar.
Understand those principles, and one might “make urbanism a quantitative science, and understand with data and numbers the construction of a city,” said statistical physicist Marc Barthelemy of France’s National Center for Scientific Research.
Sample of subway network structures from (clockwise, top left) Shanghai, Madrid, Moscow, Tokyo, Seoul and Barcelona. Image: Roth et al./JRSI