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If I was were the author, I would definitely prefer my paper to be error-free. In my opinion, pointing out a mistake isn't arrogant on your part, provided the mistake is genuine.

In order to avoid any friction, I think it is best to be completely honest in your wording of the mail when describing the error, and to make it clear why you think it would be confusing if left in the current uncorrected state.

show/hide this revision's text 2 deleted 6 characters in body

If I was the author, I would definitely prefer to be my paper to be error-free. In my opinion, pointing out a mistake isn't arrogant on your part provided the mistake is genuine.

In order to avoid any friction, I think it is best to be completely honest in your wording of the mail when describing the error, and why you think it would be confusing if left in the current uncorrected state.

show/hide this revision's text 1 [made Community Wiki]

If I was the author, I would definitely prefer to be my paper to be error-free. In my opinion, pointing out a mistake isn't arrogant on your part provided the mistake is genuine.

In order to avoid any friction, I think it is best to be completely honest in your wording of the mail when describing the error, and why you think it would be confusing if left in the current uncorrected state.