Connectedness of the approximate-root set

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Let AA be a regular ring, let α,β∈Sper⁡A\alpha,\beta\in\operatorname{Sper} A, and assume that either AA is complete or ⟨α,β⟩=m\sqrt{\langle\alpha,\beta\rangle}=\mathfrak m. Let QΛ\mathbf Q_\Lambda be the approximate roots common to α\alpha and β\beta, and write the relevant standard expansions using monomials Qθji\mathbf Q^{\theta_{ji}} and Qϵj′i\mathbf Q^{\epsilon_{j'i}}. Approximate-root connectedness conjecture. The set CC defined by the valuation inequalities and sign conditions in the source is connected; likewise, the set C′C' defined by the displayed domination inequalities and the two sign conditions is connected. These are explicit proposed reductions of the Connectedness conjecture; the paper does not establish these assertions in general.

References

Primary source

François Lucas, James Madden, Daniel Schaub and Mark Spivakovsky, “Approximate roots of a valuation and the Pierce-Birkhoff Conjecture”, arXiv:1003.1188 (2012).

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