|Principles, philosophy of science: physical principles are not the same as laws of nature. Rather, laws can be gained from principles or traced back to principles. Examples are the principle of the shortest time, the principle of the smallest effect, the uncertainty principle. See also theories, laws of nature, laws, natural constants.|
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Principle/Nozick: to show that principles explain a p, involves that they contain it. But that does not prove that p.
Richness/principle/existence/Nozick: thesis: "All possibilities are realized." - This follows from the assumption of the egalitarian theory that the options "something"/"nothing" are equal. - This requires infinitely separate possible worlds because options can be contradictory. - Then you need no explanation why something is or is not, because everything is (somewhere) realized. - Then there is no fact "X instead of Y".
Nothing: one of the unrealized possibilities is also that there is nothing - but that is one among many, not the inegalitary situation that there would be "exclusively nothing".
Consciousness/explanation/evolution theory/Nozick: consciousness allows other types of behavior: - to be guided by principles.
Philosophical Explanations Oxford 1981
The Nature of Rationality 1994