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Aug 7, 2015 at 13:14 comment added Adam Przeździecki @Dominic van der Zypen please unaccept this answer so that I can delete it.
Aug 7, 2015 at 11:49 history edited Adam Przeździecki CC BY-SA 3.0
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Aug 7, 2015 at 11:41 comment added Adam Przeździecki I see - I missed that point. So we need both $K$ and $L$ to be disconnected. Please write your answer and I will delete mine.
Aug 7, 2015 at 11:39 comment added Eric Wofsey That is not a homomorphism; it does not preserve the maximal element.
Aug 7, 2015 at 11:38 comment added Adam Przeździecki Oh, yes. Or even simpler: $K=[1,2]$ and $L=\{0\}\cup[1,2]$. Referring to your question: this is the identity $[0,1]\to\{0\}\times[0,1]$.
Aug 7, 2015 at 11:32 comment added Eric Wofsey How do you get a complete injective homomorphism $K\to L$? For a simpler example that does work, just take $K=\{0\}\cup[1,2]$ and $L=\{-1,0\}\cup[1,2]$.
Aug 7, 2015 at 11:23 vote accept Dominic van der Zypen
Aug 7, 2015 at 11:23 history answered Adam Przeździecki CC BY-SA 3.0