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<p>We present a criterion that compares modifications of the Niemytzki plane. It follows that if usual tangent discs of the Niemytzki plane are replaced by triangles with bounded angles, then the resulting space is not homeomorphic to the former.</p>

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On some modifications of the Niemytzki plane

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Wojciech Bielas

摘要

We present a criterion that compares modifications of the Niemytzki plane. It follows that if usual tangent discs of the Niemytzki plane are replaced by triangles with bounded angles, then the resulting space is not homeomorphic to the former.