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Single Idea 16834

[filed under theme 14. Science / C. Induction / 5. Paradoxes of Induction / b. Raven paradox ]

Full Idea

Without something like a hypothesis about the genes of ravens, we simply do not know what would count as a relevantly similar bird for comparison.

Gist of Idea

To pick a suitable contrast to ravens, we need a hypothesis about their genes

Source

Peter Lipton (Inference to the Best Explanation (2nd) [2004], 06 'Unsuitable')

Book Ref

Lipton,Peter: 'Inference to the Best Explanation (2nd ed)' [Routledge 2004], p.99

A Reaction

Lipton is endorsing the view that explanation should be 'contrastive', as well as aiming to discover the inner nature of ravens. He makes a good case for the contrastive approach.

The 16 ideas with the same theme [problem irrelevant evidence for a general law]:

19000 Read 'all ravens are black' as about ravens, not as about an implication [Belnap]
17674 The raven paradox has three disjuncts, confirmed by confirming any one of them [Armstrong]
15889 It is because ravens are birds that their species and their colour might be connected [Harré]
15890 Non-black non-ravens just aren't part of the presuppositions of 'all ravens are black' [Harré]
15284 Contraposition may be equivalent in truth, but not true in nature, because of irrelevant predicates [Harré/Madden]
15285 The items put forward by the contraposition belong within different natural clusters [Harré/Madden]
15287 The possibility that all ravens are black is a law depends on a mechanism producing the blackness [Harré/Madden]
16832 If something in ravens makes them black, it may be essential (definitive of ravens) [Lipton]
16836 My shoes are not white because they lack some black essence of ravens [Lipton]
16831 A theory may explain the blackness of a raven, but say nothing about the whiteness of shoes [Lipton]
16833 We can't turn non-black non-ravens into ravens, to test the theory [Lipton]
16834 To pick a suitable contrast to ravens, we need a hypothesis about their genes [Lipton]
18993 If sentences point to different evidence, they must have different subject-matter [Yablo]
19003 Most people say nonblack nonravens do confirm 'all ravens are black', but only a tiny bit [Yablo]
4782 'All x are y' is equivalent to 'all non-y are non-x', so observing paper is white confirms 'ravens are black' [Mautner, by PG]
7006 Observing irrelevant items supports both 'all x are y' and 'all x are non-y', revealing its absurdity [Schofield,J]