Isaac Newton begins the third book of his Principia with a set of four general methodological rules. They are explicitly used in generating the universal law of gravity from six propositions he calls “phenomena” together with laws and theorems which he had established earlier in the Principia. This chapter examines Newton's rules and provides a new way of understanding them that makes them very plausible and not subject to the many objections that have been raised against them by various scientists and philosophers from the eighteenth century to the present.
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