Full Idea
Some laws are held to be 'strict', and others involve a 'ceteris paribus' clause.
Gist of Idea
Laws are either 'strict', or they involve a 'ceteris paribus' clause
Source
Jaegwon Kim (Philosophy of Mind [1996], p.143)
Book Reference
Kim,Jaegwon: 'Philosophy of Mind' [Westview 1998], p.143