more from Rom Harr

Single Idea 15884

[catalogued under 10. Modality / A. Necessity / 7. Natural Necessity]

Full Idea

A statement is a law of nature if it is true in all those worlds which differ only as to their initial conditions, that is in which the underlying mechanisms of nature are the same.

Gist of Idea

Laws of nature remain the same through any conditions, if the underlying mechanisms are unchanged

Source

Rom Harr (Laws of Nature [1993], 4)

Book Reference

Harr,Rom: 'Laws of Nature' [Duckworth 1993], p.87


A Reaction

Harr takes it that laws of nature have to be necessary, by definition. I like this way of expressing natural necessity, in terms of 'mechanisms' rather than of 'laws'. Where do the mechanisms get their necessity?