A purely extensional correctness condition is compatible with an infinite range of deviant applications, as Goodman's grue paradox illustrates, leaving application norms underdetermined.

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Application norms(the rules governing how something should be used in practice): The standard guidelines or expected practices for how to correctly use or apply a rule or definition in real situations.
Deviant applications(bad applications of analogical reasoning that formal structure should prevent): Using a rule or method in weird, twisted, or unintended ways that go against what it was supposed to do.
Extensional correctness condition(describes a type of standard for judging correctness): A rule for determining if something is right or wrong based purely on what things actually exist or what examples fall into a category, rather than on the meaning or intention behind the rule.
Goodman's grue paradox(used as an example of deviant applications): A famous puzzle created by philosopher Nelson Goodman about a made-up color called 'grue' that is blue until a certain time, then turns yellow—it shows how we can create weird rules that technically fit all past observations but don't make sense.

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