Most of his work is pretty straight-forward and can be explain easily with words but did he have any contribution with mathematics or use any advance maths in his work?
actually, I don't think so...Nikola tesla used math, as every engineer does, but he used to have a more direct method of projecting...He actually "saw" his inventions, like a flash of light...He had the impression that his inventions were in front of him. He didn't use to make drawings either, because he just didn't need that.