Tailoring a pair of pants

Abstract

We show how to deform the map $\operatorname{Log}\colon (\mathbb{C}^*)^n \to \mathbb{R}^n$ such that the image of the complex pair of pants $P^\circ \subset {(\mathbb{C}^*)^n}$ is the tropical hyperplane by showing an (ambient) isotopy between $P^\circ \subset {(\mathbb{C}^*)^n}$ and a natural polyhedral subcomplex of the product of the two skeleta $S\times \Sigma \subset \mathcal{A} \times \mathcal{C}$ of the amoeba $\mathcal{A}$ and the coamoeba $\mathcal{C}$ of $P^\circ$. This lays the groundwork for having the discriminant to be of codimension 2 in topological Strominger-Yau-Zaslow torus fibrations.