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==Grue and bleen==
[[File:Grue and Bleen (EN).png|thumb|Definitions of ''grue'' and ''bleen'', as well as how the original colors ''blue'' and ''green'' can be redefined based on the two predicates
Goodman defined "grue" relative to an arbitrary but fixed time ''t'':{{efn|Historically, Goodman used ''"[[V-E day]]"'' and ''"a certain time t"'' in ''A Query on Confirmation'' (p. 383) and ''Fact, fiction, and forecast'' (3rd ed. 1973, p. 73), respectively.}} an object is grue [[if and only if]] it is observed before ''t'' and is green, or else is not so observed and is blue. An object is "bleen" if and only if it is observed before ''t'' and is blue, or else is not so observed and is green.<ref>{{cite SEP|title=Nelson Goodman|url-id=goodman|date=Mar 25, 2019}}</ref>
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{{DEFAULTSORT:New riddle of induction}}
[[Category:Philosophical paradoxes]]
[[Category:Inductive reasoning]]
[[Category:Concepts in the philosophy of language]]
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