# Gauss

The doctoral dissertation (1799) of Gauss

contained a proof of the ”fundamental theorem

of algebra” which states that every complex

non-constant polynomial in one variable has at

least one complex root. In 1807 Gauss became

a professor at Gottingen University. When

planetoid Ceres was discovered on January 1st,

1801, Gauss was able to compute its orbit from

only a few observations. On December 31st of

the same year, Ceres showed up again, exactly

where Gauss had predicted. Gauss had used

”least-squares” prediction which is based on the

assumption that the observation errors were

normally distributed. Gauss invented modular

arithmetic in 1801, and in 1831 introduced the

term ”complex number”. Together with

Wilhelm Weber, Gauss constructed the

electromagnetic telegraph in 1834.