Contrasting takes of Sophie Germain's quote from the page Who invented Diagrammatic Algebra https://mathoverflow.net/questions/168888/who-invented-diagrammatic

Contrasting takes of Sophie Germain's quote from the page Who invented Diagrammatic Algebra https://mathoverflow.net/questions/168888/who-invented-diagrammatic-algebra https://mathoverflow.net/questions/168888/who-invented-diagr... E.g. >6 points: I'd say God invented it. – Fernando Muro Commented Jun 3, 2014 at 6:38 Approved answer: Arthur Cayley. (Inspired by Sophie?) >I believe diagrammatic algebra started with 19th century invariant theorists