Ten “Laws” concerning patterns of change in the history of mathematics - Crowe
"It is safe to say that no proof given at least up to 1800 in any area of mathematics, except possibly in the theory of numbers, would be regarded as satisfactory by the standards of 1900. The standards of 1900 are not acceptable today."
ref: Ten “Laws” concerning patterns of change in the history of mathematics - Crowe. pag3
History of mathematics and PH curves in https://faculty.engineering.ucdavis.edu/farouki/research/