How was Einstein led to make a contact with Differential Geometry for his theory of General Relativity?
Where can I find the original presentation of the proof, due to Grothendieck, of the $\bar\partial$-Poincaré lemma?
Who first wrote down $S^6$'s standard almost complex structure? And who first proved that it is not integrable?
What did Jacobi, who lived before Riemann, have to do with the equation and theorem named after him in Riemannian geometry?
How did Einstein arrive at his field equations without the Bianchi identities or variational formulation?
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