He studied a lot of mathematics in his own time including trigonometry, differential and integral calculus, and complex numbers long before he met these topics in his formal education.
He-aral ng isang pulutong ng matematika sa kanyang sariling oras kasama ang trigonometrya, kaugalian at integral calculus, at kumplikadong numero ng matagal bago siya matugunan ang mga paksa sa kanyang pormal na edukasyon.