Chapter 72: fundamental theorem of algebra
72.1 Gauss
72.1.1 FToA
FToA = fundamental theorem of algebra
cf. FToLA = fundamental theorem of linear algebra
cf. FToPF = fundamental theorem of prime factorization = fundamental theorem of arithmetic = prime factorization theorem = unique factorization theorem
https://en.wikipedia.org/wiki/Fundamental_theorem_of_arithmetic
https://www.bilibili.com/video/BV1pW4y1c7Zi
https://www.bilibili.com/video/BV1U7421K7gX
72.2 equation
72.2.1 cubic equation
https://en.wikipedia.org/wiki/Cubic_equation