olemus
reaalarv \(r\), mis rahuldab mingit täisarvuliste kordajatega
algebralist võrrandit \(f ( r )=0\)
= a number that is a root of a non-zero polynomial in one variable with integer coefficients

ülevaateid
https://encyclopediaofmath.org/wiki/Algebraic_number
https://en.wikipedia.org/wiki/Algebraic_number
https://www.maths.tcd.ie/pub/Maths/Courseware/428/Primes-III.pdf