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This is a distillation of the example from Andrew.

1) Double asterisks in Text formulas get processed by the Markdown processor, thereby causing errors.

`$\int_0^\infty a*b*c dx$`

$\int_0^\infty a*b*c dx$

Workaround: put spaces around the offending pair of asterisks.

`$\int_0^\infty a * b * c \ dx$`

$\int_0^\infty a * b * c \ dx$

`$a*b*c$`

$a*b*c$

`$a * b * c$`

$a * b * c$

`$a*b*c$ normal text $a*b*c$`

$a*b*c$ normal text $a*b*c$

`$a * b * c$ normal text $a * b * c$`

$a * b * c$ normal text $a * b * c$

2) Double occurrences of underbars in Tex formulas may get picked up by the Markdown processor. E.g. in `$a _b_ c$`

the b gets italicized by Markdown. But not in `$a_b_c$`

-- Markdown does not act on underbars that are not surrounded by spaces.

`$$ a_b_c $$`

$$ a_b_c $$

`$$ a_{b_c} $$`

$$ a_{b_c} $$

`$a_b_c$`

$a_b_c$

`$a_{b_c}$`

$a_{b_c}$

`$a _b_ c$`

$a _b_ c$

Note that `$a_b_c$`

does not get processed by markdown. But this formula seems to have logical issues, and doesn't get shown as a double superscript by either MathJax or MathML. Is this even well-defined Tex? Simply disambiguating it as `$a_{b_c}$`

fixes it up for MathJax.

$5 ^ 7$

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