This is Goodman’s challenge: How can we distinguish those concepts for which inductive reasoning is appropriate from those for which it is inappropriate (projectible from non-projectible concepts)? – Fra denne gennemgang (Webside ikke længere tilgængelig) af paradokset. (engelsk)
wikipedia.org
en.wikipedia.org
Om "konfirmationsteori" se evt. Carl Gustav Hempel(engelsk) med denne reference: Studies in the Logic of Confirmation, 1943
