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Old 09-08-2018, 07:57 AM   #2
jackie_w
Grand Sorcerer
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Posts: 6,252
Karma: 16544692
Join Date: Sep 2009
Location: UK
Device: ClaraHD, Forma, Libra2, Clara2E, LibraCol, PBTouchHD3
I think you need to find a better specialised font for mathematical symbols. EB Garamond contains very few glyphs from the unicode range 27C0-2BBF.

Using kepub rather than epub sometimes helps because it has the font fallback feature, but this is still no help at all if the Kobo's fallback fonts don't contain the missing glyphs either.
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