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There is no standard, there are no "page numbers" in the epub specification. Each software is free to compute (or not) and display (or not) the page numbers in whatever way it sees fit. Some, like Adobe, assign fixed page numbers based on the size of the file; others try to calculate the actual number of screenfuls a given file is going to require in a particular font size and device; others have the option of mapping the page numbers to mimic some paper edition...
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