No, Einstein was not bad at mathematical physics. In fact, he was renowned for his exceptional mathematical abilities and his contributions to the field of theoretical physics.
Einstein's work revolutionized our understanding of space, time, and gravity with his theory of general relativity. This theory was based on complex mathematical equations that described the curvature of spacetime and its relation to the distribution of matter and energy. Developing these equations required advanced mathematical techniques and a deep understanding of differential geometry.
Additionally, Einstein made significant contributions to other areas of physics, including the photoelectric effect (for which he received the Nobel Prize in Physics in 1921) and the theory of Brownian motion. These achievements relied on his mathematical skills and his ability to formulate precise equations to explain experimental observations.
While it is true that Einstein faced some challenges in certain areas of mathematics, such as when he worked on the development of a unified field theory, these difficulties do not diminish his overall prowess in mathematical physics. Einstein's insights and mathematical genius played a crucial role in shaping modern physics and his theories continue to be fundamental pillars of our understanding of the universe.