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Jun 5, 2017 at 9:14 comment added Z. Ye The historical remarks are interesting! Sorry, for this moment I'm only interested in the $S^2$ case and my previous assumptions were too general. Now I've corrected my questions. I happen to know a bit German. Your PHD thesis is a very nice source, I will read it slowly :)
Jun 4, 2017 at 11:40 history edited user21574 CC BY-SA 3.0
in \tex format
Jun 4, 2017 at 11:30 history answered Bernd Ammann CC BY-SA 3.0