This happened when two or more students edited the document at the same time.
This approach worked pretty well, but there are a few downsides. This way all of the students could collaborate on the ever-growing document. Most recently I used a shared DropBox folder to house the file. I’ve experimented with various means of collaboration. Later I rewrote the textbook as a LaTeX file. When I started teaching the class this way it was a Word file emailed between participants. When I did this first (as a student) it was a Word file shared on a floppy disk. It is a great way to learn, and at the end of the semester the student are thrilled to hold a bound copy of the textbook that they created. At the end of the semester they have a textbook that they wrote. The class types up their work as they go. They are forbidden from looking at outside sources. The students are given the skeleton of a textbook then they must prove all the theorems and solve all of the problems. For the last 10+ years I’ve taught topology using a modified Moore method, also known as inquiry-based learning (IBL).
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