Boidhre wrote:He wasn't a professional mathematician though and knew when to bring one in to help him. I think people confuse this with him not being capable of doing the maths that got people to help him with, this wasn't the case it was just to be an expert in that area of mathematics he couldn't equally be an expert in theoretical physics due to there only being so many hours in a day.
My understanding is that as a young man he felt he could solve physical problems conceptually (special relativity), but reached an impasse he ended up needing help with (the complex mathematics of general relativity), and become a much more studious mathematician afterwards in his work towards a Unified Theory, having seen that these levels of problems did seem to require a deeper mathematical approach. He was certainly a competent mathematician at a minimum.