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Mar 11, 2019 at 21:22 comment added Michael Seifert Zangwill's discussion is in Section 16.8. I may write a summary at some point, but it'll require some thought before I can do so. In the meantime, check out Transverse wave vs the hairy-ball theorem, How do you make a spherical radio wave?, and How do coherent isotropic radiators evade the hairy-ball theorem?
Mar 9, 2019 at 22:52 comment added Michael Seifert If memory serves, there's a comment in Zangwill about this very subject. I'll try to remember to look it up when I'm in my office on Monday.
Mar 9, 2019 at 22:45 answer added Johu timeline score: 2
Mar 9, 2019 at 22:37 history asked Saurabh Shringarpure CC BY-SA 4.0