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Regularity / Fraassen: practically do not exist - E.g. things that are under your full control. - E.g. content of your pocket is no regularity - no more fundamental regularities - but we need to explain why things approximately obay to regularities. - Hypothesis: the greater uniformity will be the truer one! - (> Gradation) - Solution: postulation of microstructures (MiSt) - I 213 only observable regularities need to be explained.
B. van Fraassen
The Scientific Image Oxford 1980