Correcting professors' lecture notes One of my profs in college has (after years of students asking him to do so) put forth a syllabus with all the material for the class he is teaching.

With the help of 3 students from previous years (who did most of the writing), he made a neat 90 page syllabus covering what is taught during lectures.

My year is the first year that'll benefit from this as it was finished early September 2017 (currently in October 2017). However, as is to be expected, some typos still exist, and some little mistakes in formulas do too. I read through it and compiled a Word doc containing all the typos and mistakes I could find and was wondering if it would be badly received if I sent him an email with those. He has asked his students to tell him if they found mistakes, so I know I should probably let him know about those, but I'm not sure as to whether fixing typos will be seen as arrogant or even remotely relevant, since I'm probably the only one getting triggered by them because of my OCD.

Thanks !
I can only speak for myself, and I'm just a postdoc.

I would be indifferent if someone pointed out one or two typos; on the one hand that's helpful, on the other a bit pedantic.

However, if I received a "Word doc containing all the typos and mistakes [you] could find" in a 90 page document, I would be delighted and grateful.

As an aside, I'm currently working through a textbook to brush up my statistics skills. I'm trying to collect the mistakes that I stumble upon in order to send them to the author once I've finished the book, so he can correct them in the next edition.