Hum, the very first entry I searched for—Gregorio Ricci-Curbastro—wasn't there! Remember Ricci curvature is crucial mathematics in Einstein's Field Equations s

Hum, the very first entry I searched for—Gregorio Ricci-Curbastro—wasn't there! Remember Ricci curvature is crucial mathematics in Einstein's Field Equations so Ricci-Curbastro ought to be there: https://en.wikipedia.org/wiki/Ricci_curvature https://en.wikipedia.org/wiki/Ricci_curvature. This all looks very pretty and it's likely useful for teaching but it begs the question of how good the input data is. The old adage about garbage in, garbage out is true no matter the source.