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1:33 AM
It is sad when FGITW extremely-brute-force "answers" like this get accepted, esp. when there are much better insightful answers. Is there anything more we can do besides downvote them? @Jyrki
5
 
 
4 hours later…
5:29 AM
@ArnaudD. Thank you for noticing that, and I'm happy to keep it.
 
 
2 hours later…
7:50 AM
D1, D2, D3.
D4, D5, D6.
D7, D8, D9.
 
 
1 hour later…
8:52 AM
C1, C2, C3.
C4, C5, C6.
C7, C8, C9.
 
9:49 AM
@BillDubuque I agree. Not sure we can do much else. There's no mechanism forcing (or even nudging) such users to join in a round table discussion as to what is expected., and what others find problematic in their conduct.
Mind you, in my youth I had to handle a very similar question (if not exactly the same). At that time I didn't know about field extensions, so I had to do without. I posted a CW answer explaining the basic ideas reducing the amount of checking by a factor of ten from Mohammad's answer. Further reductions are undoubtedly possible.
 

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