The Grelling-Nelson paradox reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Grelling-Nelson paradox

The Grelling-Nelson paradox is a verbal paradox formulated in 1908 by Kurt Grelling and Leonard Nelson and sometimes mistakenly attributed to German philosopher and mathematician Hermann Weyl. It is a reformulation of the Barber paradox and Russell's paradox.

The paradox deals with the made-up words "autological" and "heterological". A word is called autological if it applies to itself. For example "short" is autological, since the word "short" is short. "Sophisticated" is also autological. Words that are not autological are called heterological. "Long" is a heterological word, for example. The obvious question arises: is "heterological" heterological? There is no consistent answer: if it is, then it isn't; if it isn't, then it is -- think it through.

More examples of heterological words:

• Monosyllabic
• Abbreviated
• Adverb (or any other part of speech word except 'Noun' or 'Adjectival')
• Purple
• Female
• Carcinogenic
• Plural
• Phonetic
• Misspelled

More examples of autological words:

• Pentasyllabic
• Pronounceable
• Confusionful
• Brief
• English
• Obfuscating

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