I graduated under the supervision of two professors, one of whom acted as main supervisor. To indicate this, I wrote the following sentence:
"I graduated under the supervision of Prof. A and the cosupervision of Prof. B."
Does the sentence correctly indicate that Prof. B was not the main supervisor? Or else "cosupervisor" simply means "to supervise jointly", so without any reference to the degree of supervision offered? After all, if I say that I coauthored a paper with somebody else, I am not giving any information as to whether or not I was the first author, right?