I am reading a research paper "Embedded minimal surface with an infinite number of ends" by Callahan etc. In this paper they said "Since we are interested in embedded surfaces, the normals at the ends are all parallel and they are all vertical". What do they mean by normals at the end and how are normals at the ends are all parallel? Thanks in advance.
2026-03-26 19:15:42.1774552542
Normals at the end
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