Braid monodromy of univariate fewnomials

نویسندگان

چکیده

Let $\mathcal{C}_d\subset \mathbb{C}^{d+1}$ be the space of non-singular, univariate polynomials degree $d$. The Vi\`{e}te map $\mathscr{V} : \mathcal{C}_d \rightarrow Sym_d(\mathbb{C})$ sends a polynomial to its unordered set roots. It is classical fact that induced $\mathscr{V}_*$ at level fundamental groups realises an isomorphism between $\pi_1(\mathcal{C}_d)$ and Artin braid group $B_d$. For fewnomials, or equivalently for intersection $\mathcal{C}$ $\mathcal{C}_d$ with collection coordinate hyperplanes in $\mathbb{C}^{d+1}$, image _* \pi_1(\mathcal{C}) B_d$ not known general. In present paper, we show _*$ surjective provided support corresponding spans $\mathbb{Z}$ as affine lattice. If strict sublattice index $b$, expected wreath product $\mathbb{Z}/b\mathbb{Z}$ $B_{d/b}$. From these results, derive application computation monodromy collections depending on common parameters.

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ژورنال

عنوان ژورنال: Geometry & Topology

سال: 2021

ISSN: ['1364-0380', '1465-3060']

DOI: https://doi.org/10.2140/gt.2021.25.3053