Steenrod closed $C_3$-invariant parameter ideals in the mod 2 cohomology of $\mathbb{Z}/2\times \mathbb{Z}/2$

Henrik Rüping, Marc Stephan

For the nontrivial action by the cyclic group $C_3$ of order $3$ on the graded polynomial ring ${\mathbb{F}}_2[a,b]$, we classify the $C_3$-invariant parameter ideals that are closed…