> I wonder how his vector math was? He was born around the same time as the invention of analytical geometry (i.e. the idea that it is possible to do geometry

> I wonder how his vector math was? He was born around the same time as the invention of analytical geometry (i.e. the idea that it is possible to do geometry using algebra), and "vector math" (or linear algebra) came several decades later. So, his vector math was non-existent.