Pencils on real curves. (English) Zbl 1307.14047
Summary: We consider coverings of real algebraic curves to real rational algebraic curves. We show the existence of such coverings having prescribed topological degree on the real locus. From those existence results we prove some results on Brill-Noether Theory for pencils on real curves. For coverings having topological degree \(\underline {0}\) we introduce the covering number \(k\) and we prove the existence of coverings of degree 4 with prescribed covering number.
MSC:
| 14H51 | Special divisors on curves (gonality, Brill-Noether theory) |
| 14P99 | Real algebraic and real-analytic geometry |
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