I know of a math paper that was plagiarized from the arxiv, and then posted to the arxiv itself. (The math was rewritten but identical. It was also wrong!) O

I know of a math paper that was plagiarized from the arxiv, and then posted to the arxiv itself. (The math was rewritten but identical. It was also wrong!) One of the authors is a full professor in Germany. There were many reasons why neither I nor the authors of the original paper pursued this issue.