Ok, \(H_e \vec r^e\) goes. That $was$ made with this:
$$H_e \vec r^e$$
but looks like math mode.
Let’s try \[ T\hbar_i \mathbf{s} ~~~ \mu_e \iint \] for display, maybe?
That the stuff. The delimiters are \\[ and \\].
What about good old $$$?
\($\lim_{r\to\infty} \oint_{C_r} \vec F(x,y) \cdot d\vec r\)$
Noooope.
Fix that limit
Let’s see if \displaystyle works in math mode. \(\displaystyle \lim_{r\to\infty} \oint_{C_r} \vec F(x,y) \cdot d\vec r\).
Oooh.
Of course, display mode shouldn’t have an issue. \[\lim_{r\to\infty} \oint_{C_r} \vec F(x,y) \cdot d\vec r \]
Indeed not.
Environments
Needs work.
\begin{align}
a & b \ c & ddf
\end{align}
To escape or not to escape
It’s worth noting that escaping the underscores withing a LaTeX expression is not necessary here. But here is the dilemma: My editor (VSCode) does not recognize MathJax and so treats each _ as an emphasis indicator, sometimes.
Another day.