Which mathematician's collected works are by far the largest?

Leonard Euler collected works that are by far the largest.

Explanation:

He is among the foremost prolific and prosperous mathematicians within the history of the sector. His seminal work had a profound impact in varied areas of arithmetic and he's wide attributable for introducing and popularizing fashionable notation and nomenclature. He's recognized for popularizing abundant of contemporary mathematics language and notation, furthermore as renowned contributions to calculus and astronomy.