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when toggle format what by license comment
Aug 13, 2018 at 14:27 comment added Ben Grossmann Oh, never mind, I see now. Well done.
Aug 13, 2018 at 14:26 comment added Ben Grossmann I also should have specified that $\phi$ is continuous. Sorry for the confusion
Aug 13, 2018 at 13:39 history answered Tom Goodwillie CC BY-SA 4.0