#### Volume 23, issue 1 (2019)

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The homotopy groups of the algebraic $K$–theory of the sphere spectrum

### Andrew J Blumberg and Michael A Mandell

Geometry & Topology 23 (2019) 101–134
##### Abstract

We calculate ${\pi }_{\ast }K\left(\mathbb{S}\right)\otimes ℤ\left[\frac{1}{2}\right]$, the homotopy groups of $K\left(\mathbb{S}\right)$ away from $2$, in terms of the homotopy groups of $K\left(ℤ\right)$, the homotopy groups of $ℂ\phantom{\rule{0.3em}{0ex}}{P}_{-1}^{\infty }$ and the homotopy groups of $\mathbb{S}$. This builds on work of Waldhausen, who computed the rational homotopy groups (building on work of Quillen and Borel) and Rognes, who calculated the groups at odd regular primes in terms of the homotopy groups of $ℂ\phantom{\rule{0.3em}{0ex}}{P}_{-1}^{\infty }$ and the homotopy groups of $\mathbb{S}$.

##### Keywords
algebraic $K$–theory, sphere spectrum, Whitehead spectrum, Waldhausen $A$–theory, stable pseudoisotopy theory, cyclotomic trace
##### Mathematical Subject Classification 2010
Primary: 19D10, 55Q10