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Today I learned that the person that proved the equations of general relativity (for empty space) always have well defined solutions was a french lady who died about three weeks ago.
Dr Yvonne Choquet-Bruhat proved this via results published in 1952 and 1969: https://en.wikipedia.org/wiki/Yvonne_Choquet-Bruhat #historyofscience #generalrelativity
@tobychev
The book "Analysis, Manifolds and Physics", co-authored by her, Cécile DeWitt-Morette, and Margaret Dillard-Bleick (https://annas-archive.org/md5/fe73905cb5cd33dccc039767d5e178e4) is still one of the best if not the best book on differential geometry.