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26

Use \setminus for the result $𝐿(𝐴)\setminus𝐿(𝐵)$.

21

Here's a list of possible solutions that I could come up with (includes a curated Detexify output), the first two are the other two current answers: $L(A)\backslash L(B)$ $L(A)\backslash L(B)$ \$L(A)\setminus L(B)$$L(A)\setminus L(B) (looks the same as the next too) L(A)\mathbin{\setminus}L(B) L(A)\mathbin{\backslash}L(B)  L(A)⧵L(B)  L(A)⧵L(B)using ... 20 If you want a real backslash, and not something spaced like a binary operation, use L(A)\backslash L(B) to get$$ L(A) \backslash L(B) $$11 For fun: How can I make \ appear in MathJax? The command \cancel produces a forward slash: \require{cancel}\cancel{\phantom{k}}. A simple rotation flips it around to produce a backslash. So \require{cancel} L(A)\!\!\! \style{display: inline-block; transform: rotate(90deg)}{\cancel{\phantom{mm}}} \!\!\! L(B) gives$$\require{cancel}L(A)\!\!\! \...

11

Use mathjax for mathematics, not for text formatting. The mathjax italics happen because mathjax thinks "abcde" is just a string of variables.

7

The size directives \large etc. are not commands taking arguments. Their effect lasts until the scope(1) in which they were issued ends. The same holds for style selectors like \displaystyle, \scriptscriptstyle and so on. Thus wrapping G(x_1, \dotsc, x_n) in braces doesn't make it an argument to \large, it just makes the expression an ordinary maths atom (...

3

Drawbacks of using MathJaX I can figure are: MathJaX can possibly fail with Javascript disabled ( as it's an AJAX ( Asynchronous Javascript And XML) library emulating LaTeX) which loses the effect. Markdown doesn't take a menu to copy a phrase from. It might be confused for actual math content, on a math website. The word or phrase, won't necessarily be ...

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