olemus
matemaatikaharu, mis kirjeldab dünaamiliste süsteemide ebastabiilsust, keskendub järsule kvalitatiivsele muutusele
alusparameetrite sujuval kvantitatiivsel muutumisel
Wiktionary:
the branch of mathematics dealing with dynamical systems which can undergo abrupt irreversible qualitative changes due to a tiny change in parameters

ülevaateid
https://en.wikipedia.org/wiki/Catastrophe_theory
https://www.math.wisc.edu/~robbin/catastrophe/catastrophe_talk.pdf
http://mat.uab.cat/~SYTM/pdf/sytm-Margalef.pdf
https://www.springer.com/la/book/9783642967993
https://is.muni.cz/el/sci/jaro2018/M6201/um/48281991/RosserCatastrophe.pdf

rakendusi (applications)
https://dspace.library.uu.nl/bitstream/handle/1874/872/c6.pdf
https://www.hindawi.com/journals/scn/2019/5306395/
https://calhoun.nps.edu/bitstream/handle/10945/45469/Lewis_Critical_Infrastructure_2011.pdf;sequence=4
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3546768/