A course came up that I was interested in (C*algebras). It's a grad class but was offered to a select group of undergrads including myself. I accepted the offer but then once the class started I received an email saying the following:
I have just noticed that you have not completed Math 311. I think it would be a terrible idea for you to be doing the operator algebra course before completing that. It would also be irresponsible of me to let you do it. This isn't really dependent on why you didn't complete the course. The appearance alone would make me look bad.
I replied that I have 100% on all but one assignment and an A+ on the midterm. I haven't yet taken the final but it will be scheduled by the end of the semester. (I couldn't take the exam for health reasons that he knows of.)
He knows I am an A+ student and has given me 2 A+'s in the 2 classes I have taken with him. I tried speaking with the instructor of the Math 311 course and asked him to speak with said prof to see if he could convince him that I know the material but I'm not sure how that will go.
I don't know why this prof would rescind the invitation when we seemed to have previously had a good rapport. The prof does know that this would be my 6th class for the term which may be a contributing factor. (4th at 4th year or above)
Is there anything else I can do to increase my chance of getting into this class?
Also I don't want to damage my relationship with this prof further as I hoped to ask them to do a summer research project.