In Sigil, BookView is practically deprecated and is really not the best way to edit any ebook. Enable Sigil's Preview window and your mathml should properly appear.
Please remember Sigil is an ebook editor, not an ebook reader such as calibre. Calibre has long supported use of mathml for epub2 in its ebook reader app.
Last edited by KevinH; 02-04-2018 at 05:53 PM.
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