On Huisman's conjectures about unramified real curves

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Contributors

Abstract

Let X Pn be an unramified real curve with X(R) ≠ 0. If n ≥ 3 is odd, Huisman [9] conjectured that X is an M-curve and that every branch of X(R) is a pseudo-line. If n ≥ 4 is even, he conjectures that X is a rational normal curve or a twisted form of such a curve. Recently, a family of unramified M-curves in P3 providing counterexamples to the first conjecture was constructed in [11]. In this note we construct another family of counterexamples that are not even M-curves. We remark that the second conjecture follows for generic curves of odd degree from the de Jonquières formula.

Details

Original languageEnglish
Pages (from-to)545-549
Number of pages5
JournalAdvances in geometry
Volume21
Issue number4
Publication statusPublished - 1 Oct 2021
Peer-reviewedYes

External IDs

Scopus 85117941762

Keywords

ASJC Scopus subject areas

Keywords

  • Real algebraic curve, M-curve, ramification