olemus
matemaatikaharu, käsitleb rühmade omadusi
=
a mathematical discipline, the study of groups, which are systems consisting of a set of elements and a binary operation

ülevaateid
https://en.wikipedia.org/wiki/Group_theory

https://en.wikiversity.org/wiki/Introduction_to_group_theory#:~:text=Group%20theory%20is%20the%20study,and%20complex%20numbers%20as%20well.

http://dogschool.tripod.com/groups.html

http://math.mit.edu/~jwellens/Group%20Theory%20Forum.pdf

https://www.maths.gla.ac.uk/~mwemyss/teaching/3alg1-7.pdf

http://www.jmilne.org/math/CourseNotes/GT.pdf

rakendusi
https://www.sciencedirect.com/book/9781483231884/group-theory-and-its-applications

https://arxiv.org/pdf/0906.5545.pdf

http://personal.rhul.ac.uk/uhah/058/talks/bedlewo2010.pdf

https://www.hindawi.com/journals/mpe/2018/9507823/