ScalingStacks

The multiplication is given as follows:

(3.1.1) Tw​Tw′={Tw​w′ if ​ℓ​(w​w′)=ℓ⁡(w)+ℓ⁡(w′)0 otherwise.T_{w}T_{w^{\prime}}=\begin{cases}T_{ww^{\prime}}&\text{ if }\ell(ww^{\prime})=\ell(w)+\ell(w^{\prime})\\ 0&\text{ otherwise.}\end{cases}

Original mathematics by the credited authors. Source collection and HTML conversion remain in progress.

Andrew Manion, Raphael Rouquier

Original source: arXiv:2009.09627v2