The $\mathbb{C}$-motivic wedge subalgebra

Abstract

We describe some regular behavior in the motivic wedge, which is a subalgebra of the cohomology Ext$_{\mathbf{A}}(\mathbb{M}_2,\mathbb{M}_2)$ of the $\mathbb{C}$-motivic Steenrod algebra. The key tool is to compare motivic computations to classical computations, to Ext$_{\mathbf{A}(2)}(\mathbb{M}_2,\mathbb{M}_2)$, or to $h_1$-localization of Ext$_{\mathbf{A}}(\mathbb{M}_2,\mathbb{M}_2)$. We also give a conjecture on the behavior of the family $e_0^tg^k$ in Ext$_{\mathbf{A}}(\mathbb{M}_2,\mathbb{M}_2)$ which raises naturally from the study of the motivic wedge.