Full Idea
Principle of Naturalist Closure: A serious metaphysical claim must involve at least two scientific hypotheses, at least one from fundamental physics, and explain more than what the two hypotheses explain separately.
Gist of Idea
Metaphysics must involve at least two scientific hypotheses, one fundamental, and add to explanation
Source
J Ladyman / D Ross (Every Thing Must Go [2007], 1.3)
Book Reference
Ladyman,J/Ross,D: 'Every Thing Must Go' [OUP 2007], p.37
A Reaction
[compressed, from their longer qualified version] The idea that metaphysics should add to explanation is close to my heart. I am musing over whether essences add to explanation, which would be total anathema to Ladyman and Ross.