As research grows even more intricate in fields such as pure and applied math (and other technical areas), very few reviewers now have a complete picture of any single field. Thus it should be common for more mistakes to be published (in a journal or in a conference).
This said, it is very uncommon for anyone to (at least successfully) edit an article after it has been published. Some reasons for editing may include:
- a (reasonably minor) error has been spotted, e.g., a negative sign is missing, typos that are not simply grammatical mistakes.
- an important reference that was missed.
- a result which has been proven wrong because of a very technical edge case that everyone has missed, but was not essential to the proof.
- simulation was off by a tiny factor
- some other minor, and not detrimental issue to the paper, such as a misplaced figure, mis-referenced equation (cannot tell you how many published papers have [?] in them)
Nor are there really any mechanism in place to promote authors to fix errors after publication. Yet plenty options for authors to repeat upload till "final version".
I am very curious as to why this is the case.