In this question I asked about a theorem in an old paper. I gave many details explaining the difficulty I was having in following the proof. The author of the paper kindly replied, pointing me to a counterexample to the theorem as stated and a correct proof of a slight modification, both published much more recently. I think it is valuable to leave the question and answer visible, to help prevent other people from falling into the same trap. On the other hand, the details in the question are now mostly irrelevant. I wonder whether it would be best to remove them and just leave a stub. What do people think?
I think such things show (to those willing to discern) that mathematics is a human activity, and that yours is an example of how to deal with mistakes. I would prefer to see the details stay up, especially as some of the details may turn out to be important in a similar but different context.
For those in a hurry, you can add to your update a brief summary of what happened at the top, and leave the rest for historical and human interest.
Gerhard "Keep History Visible To All" Paseman, 2015.09.18