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|Fraassen I 104
Relevance/explanation/ScrivenVsHempel/BrombergerVsHempel: Relevance provides neither sufficient nor necessary conditions that something is an explanation - not sufficient: good belief reasons are no explanation. - E.g. redshift cannot be a reason for the expansion. - Unnecessary: not every explanation gives good belief reasons. - E.g. rare disease as a result of a frequent disease: - So you advise for treatment - but it would not be rational to expect that the disease occurs. - E.g. a very small amount of uranium does probably not radiate - but when it radiates the correct explanation is, that it is uranium - E.g. a man that takes birth control pills and does not get pregnant.
Relevance insufficient: E.g. 90% of the plants are killed: then it is not an explanation for the plants that survived that they were sprayed.
B. van Fraassen
The Scientific Image Oxford 1980