How can I text in between "dollar signs" on MSE.

Question

Suppose I have to write $\sum a_g$ such that $g \in G$ then can I start with "dollar sign" and then write whole thing and end "dollar sign" in last without italicising or any effect on my text "such that".
Like $this gets italicised$....

Answer 1

Do you mean something like: $\{n\in\mathbb N; n\text{ is even}\}$?

Typeset as: $\{n\in\mathbb N; n\text{ is even}\}$

I will add that it is also mentioned here (warning - contains lot of MathJax, do not open from slow mobile devices): MathJax basic tutorial and quick reference

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In my personal opinion there is not much reason to use this in inline text. It makes sense when you want to define some set and want to have it as a single formula. Or when you use centered formulas $$2\mathbb N = \{n\in\mathbb N; n\text{ is even}\}.$$

But I would write: "Consider all sums $\sum\limits_{n\in A} a_n$ where $A\subseteq 2\mathbb N$." (without using \text) rather than "Consider all sums $\sum\limits_{n\in A} a_n\text{ where }A\subseteq 2\mathbb N$." (which uses \text). (The first one was typeset as Consider all sums $\sum\limits_{n\in A} a_n$ where $A\subseteq 2\mathbb N$. The second one was typeset as Consider all sums $\sum\limits_{n\in A} a_n\text{ where }A\subseteq 2\mathbb N$.)

Although they might look similar, I think that distinguishing what is text and what is mathematical formula is useful.