@article{article_900705, title={A new approach to a theorem of Eng}, journal={Hacettepe Journal of Mathematics and Statistics}, volume={50}, pages={1679–1680}, year={2021}, DOI={10.15672/hujms.900705}, author={Arslan, Hasan}, keywords={Coxeter groups, descent algebras, Poincaré polynomial, the longest element, $q=-1$ phenomenon}, abstract={The main aim of this work is to give a case-free algebraic proof for a theorem of Eng on the Poincaré polynomial of parabolic quotients of finite Coxeter groups evaluated at -1.}, number={6}, publisher={Hacettepe University}