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Height function following Borel

As usual, it is very difficult to identify the first occurrence of a term, but in this case it is Borel's own article that can help us. The full note can be found here, we read: Étant donné un ...
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Definition and name change of the oscillation function

The notation is a bit harsh, but Ascoli defines 'oscillazione' in the following paper (p. 867, paragraph 6; see also p. 869, at the top, for a reference to Riemann, Über die Darstellbarkeit einer ...
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