Editorial

Bolker E D Crapo H , 1977 “How to brace a one-story building” Environment and Planning B 4 125–152

MacMahon P A , 1892 “The combination of resistances” The Electrician 28 601–602

Parkinson G H R , 1966 Leibniz: Logical Papers (Oxford University Press, London)

Reuleaux F , 1876 The Kinematics of Machinery: Outlines of a Theory of Machines translated and edited by Kennedy A B (Macmillan, London)

Riordan J Shannon C E , 1942 “The number of two-terminal series-parallel networks” Journal of Mathematics and Physics 21 83–93

Simon H A , 1969 The Sciences of the Artificial (MIT Press, Cambridge, Mass)