Groupoids, the Phragmen-Brouwer Property and the Jordan Curve Theorem
英文摘要：
We publicise a proof of the Jordan Curve Theorem which relates it to the Phragmen-Brouwer Property, and whose proof uses the van Kampen theorem for the fundamental groupoid on a set of base points.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
