English

Totally real immersions of surfaces

Differential Geometry 2009-09-21 v1

Abstract

Totally real immersions ff of a closed real surface Σ\Sigma in an almost complex surface MM are completely classified, up to homotopy through totally real immersions, by suitably defined homotopy classes M(f)\frak{M}(f) of mappings from Σ\Sigma into a specific real 5-manifold E(M)E(M), while M(f)\frak{M}(f) themselves are subject to a single cohomology constraint. This follows from Gromov's observation that totally real immersions satisfy the h-principle. For the receiving complex surfaces C2C^2, CP1×CP1CP^1\times CP^1, CP2CP^2 and CP^2 # m\bar{CP^2}, m=1,2,...,7m=1,2,...,7, and all Σ\Sigma (or, CP^2 # 8\bar{CP^2} and all orientable Σ\Sigma), we illustrate the above nonconstructive result with explicit examples of immersions realizing all possible equivalence classes. We also determine which equivalence classes contain totally real embeddings, and provide examples of such embeddings for all classes that contain them.

Keywords

Cite

@article{arxiv.math/0612855,
  title  = {Totally real immersions of surfaces},
  author = {Andrzej Derdzinski and Tadeusz Januszkiewicz},
  journal= {arXiv preprint arXiv:math/0612855},
  year   = {2009}
}

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71 pages