Guys,
Are you sure Noto is suitable for specialist maths purposes?
I have a copy of Noto Serif sideloaded on all my Kobos but it did not help with the OP's test epub. It was the first font I tried earlier today because I knew it contained a lot of less common glyphs. I discovered this from some extensive testing I did when trying to decide on a suitable font for displaying my Kobo custom English dictionaries with all the special glyphs used for pronunciation and word origin. Noto Serif worked very well for the dictionaries.
I should mention the caveat that my copy of Noto came from a customised version posted in these forums rather than direct from Google fonts. So there could be a difference in their glyph coverage.
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