olemus
reaalarv, mis ei ole ratsionaalarv,
st ei ole väljendatav murruna

ülevaateid
https://www.mathsisfun.com/irrational-numbers.html

https://en.wikipedia.org/wiki/Irrational_number

http://mathworld.wolfram.com/IrrationalNumber.html

https://blossoms.mit.edu/sites/default/files/video/download/Rational-Irrational-handout.pdf

https://webusers.imj-prg.fr/~michel.waldschmidt/articles/pdf/AWSLecture1.pdf

https://core.ac.uk/download/pdf/70985859.pdf

http://www.sfu.ca/~zazkis/publications/Irrational%20Gap.pdf