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'fragments/reports', 'Phil of Mathematics and Natural Science' and 'Laws of Nature'
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17 ideas
26. Natural Theory / A. Speculations on Nature / 2. Natural Purpose / a. Final purpose
20812
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Covers are for shields, and sheaths for swords; likewise, all in the cosmos is for some other thing [Chrysippus]
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26. Natural Theory / A. Speculations on Nature / 6. Early Matter Theories / f. Ancient elements
21403
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The later Stoics identified the logos with an air-fire compound, called 'pneuma' [Chrysippus, by Long]
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20828
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Fire is a separate element, not formed with others (as was previously believed) [Chrysippus, by Stobaeus]
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5975
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Stoics say earth, air, fire and water are the primary elements [Chrysippus, by Plutarch]
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26. Natural Theory / B. Natural Kinds / 1. Natural Kinds
15886
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Science rests on the principle that nature is a hierarchy of natural kinds [Harré]
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26. Natural Theory / D. Laws of Nature / 1. Laws of Nature
15864
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Classification is just as important as laws in natural science [Harré]
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15865
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Newton's First Law cannot be demonstrated experimentally, as that needs absence of external forces [Harré]
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26. Natural Theory / D. Laws of Nature / 2. Types of Laws
15862
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Laws can come from data, from theory, from imagination and concepts, or from procedures [Harré]
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15870
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Are laws of nature about events, or types and universals, or dispositions, or all three? [Harré]
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15871
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Are laws about what has or might happen, or do they also cover all the possibilities? [Harré]
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26. Natural Theory / D. Laws of Nature / 5. Laws from Universals
15876
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Maybe laws of nature are just relations between properties? [Harré]
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26. Natural Theory / D. Laws of Nature / 7. Strictness of Laws
15872
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Must laws of nature be universal, or could they be local? [Harré]
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15867
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Laws describe abstract idealisations, not the actual mess of nature [Harré]
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15860
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We take it that only necessary happenings could be laws [Harré]
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26. Natural Theory / D. Laws of Nature / 8. Scientific Essentialism / c. Essence and laws
15892
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Laws of nature state necessary connections of things, events and properties, based on models of mechanisms [Harré]
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26. Natural Theory / D. Laws of Nature / 8. Scientific Essentialism / e. Anti scientific essentialism
10246
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The limit of science is isomorphism of theories, with essences a matter of indifference [Weyl]
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26. Natural Theory / D. Laws of Nature / 9. Counterfactual Claims
15875
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In counterfactuals we keep substances constant, and imagine new situations for them [Harré]
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