Abstract:We explain why Theorem B in the original article does not follow from the main result of this paper (Theorem A). While we conjecture that Theorem B should nevertheless be true, in this erratum we prove a slightly weaker version of it.Theorem B in the original article is not a mere corollary of Theorem A, contrary to what was stated in the original article. Indeed, the proof implicitly uses the assumption that, for a system with a unique focus-focus singularity, the twisting index must be trivial, which does no… Show more
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