We study injective versions of the characterization of sets potentially in a Wadge class of Borel sets, for the first Borel and Lavrentieff classes. We also study the case of oriented graphs in terms of continuous homomorphisms, injective or not.

中文翻译：

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平面内低复杂度的注入测试

对于第一个 Borel 和 Lavrentieff 类，我们研究了可能在 Borel 集合的 Wadge 类中的集合表征的单射版本。我们还根据连续同态（单射与否）研究了有向图的情况。