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Published online by Cambridge University Press: 30 January 2025
This chapter discusses terminal coalgebras obtained by methods other than the finitary iteration that we saw in Chapter 3. One way is by taking a quotient of a weakly terminal coalgebra. Another is to use Worrell’s Theorem: the terminal coalgebra of a finitary set functor is obtainable as a limit, using a doubled form of infinite iteration. The chapter also contains a number of presentations of the terminal coalgebra of the finite power-set functor on sets and of the first infinite limit of its terminal-coalgebra chain.
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