Topological equivalence to a projection
英文摘要：
We present a necessary and sufficient condition for the topological equivalence of a continuous function on a plane to a projection onto one of coordinates.
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关于有向同伦等价与一种有向拓扑复杂度的观念
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LIX, Ecole Polytechnique, CNRS, Université Paris-Saclay（LIX实验室，巴黎综合理工学院，法国国家科学研究中心，巴黎萨克雷大学）
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