If _ used between blocks then they are interpreted as italics.
Solution: math-blocks between $ and $$ should skip markdown interpretation like in kramdown.
The example shows problem with the underbraces' underscore.
## anki title: show problem
No problem:
$x_1 + x_2$
$$x_2 + x_4$$
Problem:
${y}_{3} + {y}_{4}$
$$
{y}_{3} + {y}_{4}
$$
If _ used between blocks then they are interpreted as italics.
Solution: math-blocks between $ and $$ should skip markdown interpretation like in kramdown.
The example shows problem with the underbraces' underscore.