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It appears (e.g. this thread) that the "accepted answer" thing fits the working model of programmers much better than it does for mathematicians. We are using this feature, of course, where it fits us, but if it doesn't, I would say, feel free to experiment a bit.
I personally tend to think that it would be preferable for questions to eventually have an accepted answer that summarizes the current community knowledge. For example, when there are several complementary answers, you can write their summary as a community wiki post and accept it. If a much better answer appears, you can re-accept it.
Whatever you do, it makes sense to clearly say by editing the original question.
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