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TeX equations are not part of the epub3 spec. The spec talks only about mathml. In fact, the MathJax configuration that Sigil uses actually disables TeX support to minimize the size of the plugin itself. Also the TeX equations requires additiinal html and css support as well as the mathjax fonts. Supporting it in Sigil will not happen as it interferes with click to sync between Preview and CodeView, bloats MathJax, and is not epub3 spec compliant.
As for the Readium Reader plugin, it does not support Mathml at all without additional code to pull it in over the net. My guess is that is what you are running into.
So supporting TeX equations I will leave for other
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