Steenrod closed parameter ideals in the mod-$2$ cohomology of $A_4$ and $SO(3)$

Henrik Rüping, Marc Stephan, Ergun Yalcin

In this paper, we classify the parameter ideals in $H^{\ast }(B{A}_4;{\mathbb{F}}_2)$ and in the Dickson algebra $H^{\ast }(BSO(3);{\mathbb{F}}_2)$ that are closed under Steenrod operations. Consequ…