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A monotone function is also called isotone, or order-preserving. The dual notion is often called > antitone, anti-monotone, or order-reversing. Hence, an antitone function f satisfies the property
As I understand, you are implying that for us to find a greatest fixed point of a function, it must be antinone. Not that I contend the point; it's just that, unfortunately, I don't know what "antinone" is. A quick search doesn't help either. (In fact, this very haddock is the top link.) I looked through the index of Introduction to Lattices and Order, which is considered a standard intro to lattices and it does not seem to mention "antinone" at all. (While "monotone" is, of course, there.) So, I still don't know what it means and whether I could use
gfpFrom
with any of my functions.I suggest adding some elaboration on the meaning of "antinone" to the relevant parts of the haddock.
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