Quote:
According to Asimov, the premise was based on ideas in Edward Gibbon's History of the Decline and Fall of the Roman Empire,
[snip]
Four years later, Asimov followed up with yet another sequel, Foundation and Earth (1986), which was followed by the prequels Prelude to Foundation (1988) and Forward the Foundation (1993), published after his death in 1992
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https://en.wikipedia.org/wiki/Foundation_series
So it could be prequel, sequel or fan fiction.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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