If I remember correctly, Einstein struggled with Tensors and enlisted his friend Mercel Grossmann to help him develop the Tensor Calculus he needed for the Gene

If I remember correctly, Einstein struggled with Tensors and enlisted his friend Mercel Grossmann to help him develop the Tensor Calculus he needed for the General Theory of Relativity. Einstein was no mathematical slouch, obviously, but it’s nice to know that even the most brilliant sometimes need some help from their friends.