The Euclidean Algorithm (for finding the greatest common divisor)
originally had the title "A Euclidean Algorithm."
A user (who happens to be German according to his profile) proposed an edit as follows:
"An Euclidean Algorithm"
Now I can understand this mistake from a native German speaker because "An Eulerian Algorithm" (German-speaking Swiss mathematician, German pronounciation) would be correct while "A Eulerian Algorithm" would be wrong.
But the pronounciation of "Euclid" is either Greek or an Anglicised version of it, so it's definitely "A Euclidean Algorithm" just like it would be "A European Algorithm."
This is an edit I would personally not have bothered to make, even if the original was wrong, because it is a single character that does nothing to enhance the intelligibility of the post. What I find surprising, is that two other reviewers approved this edit, even though the original was correct and the edit was wrong.
The OP has dealt with this by using "The Euclidean Algorithm" instead (I am considering enhancing the title to a more descriptive one.)
Do we really need trivial edits based on grammar, if the meaning is clear?
When "reviewing" other people's edits, can we please do just that. The idea is to review, not blindly approve.
I made my reasons for rejecting this edit clear. Did the other reviewers not read them? There are currently no other suggested edits in the review queue, so I cannot check if other people's edit rejections show up clearly.
Problems with the system: There was sufficient space in the "reject reason" box to explain that Euclid is pronounced "Yuclid" but not to compare and contrast with the pronunciation of Euler. I don't know why this box has to be so small. Also, I've noticed before that while you can ping a commenter on a question with another comment, if you see a wrong edit after it has been made, there seems to be no way to ping the editor (unless they happen to have also left a comment on the question.)
EDIT: In response to Timwi's answer, I'd like to point out that this is not the only incident of incorrect edit approval. To mention just one example, in my answer Suggested Edits: Reject Golfing? I mention an incorrect tag edit that got accepted. If you're not sure about an edit, you can "Skip."