Yeah. Sorry. Copy pasted badly. The link was right though... Speaking of which: https://en.wikipedia.org/wiki/History_of_general_relativity#Creation_of_genera

Yeah. Sorry. Copy pasted badly. The link was right though... Speaking of which: https://en.wikipedia.org/wiki/History_of_general_relativity#Creation_of_general_relativity https://en.wikipedia.org/wiki/History_of_general_relativity#... Seems he had most of the concept nailed down by 1907 but was struggling with the math. So, he worked the module step-by-step only adding gravity in 1915 after learning about Riemannian manifolds.