On products of beta and gamma elements in the homotpy of the first Smith-Toda spectrum

TL;DR

This paper computes the first cohomology of a specific comodule at an odd prime and uses it to demonstrate non-trivial products of beta and gamma elements in the homotopy groups of the Smith-Toda spectrum V(1).

Contribution

It verifies and extends previous cohomology calculations at prime 3, providing new insights into the homotopy of the Smith-Toda spectrum V(1).

Findings

Determined the first cohomology of M^1_2 at prime 3.

Showed non-trivial products of beta and gamma elements in homotopy groups.

Established a foundation for future cohomology computations of M^3_0.

Abstract

In this paper, we determine the first cohomology of the monochromatic comodule $M^1_2$ at an odd prime, and apply the results to show non-trivialities of some products of beta and gamma elements in the homotopy groups of the Smith-Toda spectrum $V(1)$. The cohomology for a prime greater than three was determined by the first author. Here, we verify them and determine the cohomology at the prime 3 by elementary calculation. The cohomology will be a stepping stone for computing the cohomology of the monochromatic comodule $M^3_0$, which we hope to determine for a long time.