The additions made reference to events in Asimov's Robot and Empire series, indicating that they were also set in the same fictional universe.
The premise of the series is that the mathematician Hari Seldon spent his life developing a branch of mathematics known as psychohistory, a concept of mathematical sociology.
Seldon also foresees an alternative where the interregnum will last only one thousand years.
To ensure the more favorable outcome, Seldon creates a foundation of talented artisans and engineers at the extreme end of the galaxy, to preserve and expand on humanity's collective knowledge, and thus become the foundation for a new galactic empire.
Foundation was originally a series of eight short stories published in Astounding Magazine between May 1942 and January 1950.
The Foundation series is a science fiction series of books by Isaac Asimov.
For nearly thirty years, the series was a trilogy: Foundation, Foundation and Empire, Second Foundation.
It won the one-time Hugo Award for "Best All-Time Series" in 1966.
Asimov began adding to the series in 1981, with two sequels: Foundation's Edge, Foundation and Earth, and two prequels: Prelude to Foundation, Forward the Foundation.
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