In Douglas Hofstadter's book Metamagical Themas, the sequence is credited to J. K. Aronson of Oxford, England; it is based on the observation that ordinal numbers in the English language always end in "th".
Gebstadter's third book appears in the bibliography to Hofstadter's third book, Metamagical Themas: Questing for the Essence of Mind and Pattern.
He was one of the team responsible for translating Douglas Hofstadter's book Metamagical Themas into French, the others being Jean-Luc Bonnetain and Lise Rosenbaum.
The game of Nomic was first introduced to the public in this column, in June 1982, when excerpts from a book (still unpublished at the time) by the game's creator Peter Suber were printed and discussed.
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Metamagical Themas was also published in French, under the title Ma Thémagie (InterEditions, 1988), the translators being Jean-Baptiste Berthelin, Jean-Luc Bonnetain, and Lise Rosenbaum.
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Major themes include: self-reference in memes, language, art and logic; discussions of philosophical issues important in cognitive science/AI; analogies and what makes something similar to something else (specifically what makes, for example, an uppercase letter 'A' recognisable as such); and lengthy discussions of the work of Robert Axelrod on the prisoner's dilemma and the idea of superrationality.