Super-, Subscripts and Fractions
For occasional vertically shifted characters, these replacement codes are sufficient.
For complex mathematical or chemical formulas, LaTeX notation is probably the better choice.
Syntax
x{_4} x{^4} {^3}⁄{_4}
The HTML entity ⁄ corresponds to a fraction line.
Layout
x4 x4 X4 X4 x3 x3 X3 X3 3⁄4
Compare the theme styling to the one the Plex fonts provide as special Unicode numbers:
x₄ x⁴ X₄ X⁴ x₃ x³ X₃ X³ ³⁄₄
These glyphs are very small and the subscripts are not placed consistently. Therefore, I recommend replacements that also work for other characters like alphabetical indices and the 1st, 2nd, 3rd, 4th,…
Chemical Formula
Ethanol with the structural formula C2H5OH is better known as the alcohol.
Mathematical Formula
Simple formulas like E = mc2 or functions like f(x) = 3x2 + 5x5.
Fractions
Every fraction like 232⁄747 may be included using super- and subscripts with a fraction line (entity ⁄) in between them.