I independently wrote a number of math articles, and published some of them in refereed journals. I wrote the draft of the thesis, and contacted a Prof., and started a PhD program under his supervision. After being accepted, the supervisor
Asked me to change all notations and terminology. I hesitate, because I used the terminology in use in the domain, I kept at minimum new terms, and I already used these terms in the published papers.
Asked me to make him coauthor of some of the papers I haven't yet published, and which I wrote previously, without any suggestion or discussion with him. He motivated his request by saying that my articles need to be polished (ie terminology changed with an invented one), and that even when they will be ready, nobody will accept them with my name only (although I already published some articles as single author).
He is very assertive with these requests, and I feel like he is putting pressure on me. Normally, I would like to have him as coauthor, and maybe it will be good for my career. But I am affraid that he will make my results unrecognizable, and incompatible with the other papers in domain, including my owns. And, frankly, his only contribution is that he suggested to change the terminology.
What should I do?