@inproceedings{Lekeu:2021cA, author = "Lekeu, Victor", title = "{Modave lecture notes: two useful topics in Lie algebras}", doi = "10.22323/1.389.0001", booktitle = "Proceedings of XVI Modave Summer School in Mathematical Physics {\textemdash} PoS(Modave 2020)", year = 2021, volume = "389", pages = "001" }