Very easy solution of my old conjecture
Like a complete idiot, this took me a few years to disprove my conjecture, despite the proof is quite trivial.
Here is the complete solution:
Example , where
is the complete lattice generated by a strong partition
of filter on a set.
Proof Consider any infinite set and its strong partition
.
consists only of principal filters.
But obviously contains some nonprincipal filters.
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