Fable 5.1 found a flaw in Arrhenius's sixth population ethics impossibility theorem — or did it?

birchlse · x · 2026-09-04

Will MacAskill reports that Fable 5.1 found Arrhenius's sixth and favored population ethics impossibility theorem is false as stated (though fixable), suggesting huge overhang from improving formal methods in philosophy. birchlse replies that this may be the same problem noted earlier by Teruji Thomas — so Fable shouldn't get the credit, hinting the model may have restated a known result rather than produced an original finding.

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