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Markdown input:

Preview:

Output: (matches the preview)

$a \$ b$

Markdown input:

Preview:

Output:

$a \$ b$

Markdown input:

Preview:

Output: (matches the preview)

$a \$ b$

Markdown input:

Preview:

Output:

$a \$ b$

15. Special characters used for MathJax interpreting can be escaped using the `\` character: `\$` $\\\$$, `\{` $\{$, `\_` $\_$, etc. If you want `\` itself, you should use `\backslash` (symbol) or `\setminus` ([binary operation](https://tex.stackexchange.com/a/511332)) for $\backslash$, because `\\` is for a new line. 

15. Special characters used for MathJax interpreting can be escaped using the \ character: \$ $\$$, \{ $\{$, \_ $\_$, etc. If you want \ itself, you should use \backslash (symbol) or \setminus (binary operation) for $\backslash$, because \\ is for a new line.

To explain:

1. First blockquote is a screenshot of the rendered output of the MathJax tutorial (revision 104) as I see it on my screen.
2. Second blockquote shows the Markdown input used for the portion in the previous screenshot.
3. Third blockquote contains the above Markdown input.
4. Fourth blockquote is a screenshot of the preview (i.e., before submission) of the stuff in 1--3.
5. Fifth blockquote is a screenshot of the rendered output (i.e., after submission) of the stuff in 1--4.

Notice that there is a discrepancy between the preview shown for \$ and its rendered output.

• The Markdown input is "backslash dollar".

  

• The preview displays as "backslash backslash dollar".
• The rendered output is "backslash backslash backslash dollar". Why the discrepancy?

Markdown input:

Preview:

Output: (matches the preview)

$a \$ b$

Markdown input:

Preview:

Output:

$a \$ b$

15. Special characters used for MathJax interpreting can be escaped using the `\` character: `\$` $\\\$$, `\{` $\{$, `\_` $\_$, etc. If you want `\` itself, you should use `\backslash` (symbol) or `\setminus` ([binary operation](https://tex.stackexchange.com/a/511332)) for $\backslash$, because `\\` is for a new line. 

15. Special characters used for MathJax interpreting can be escaped using the \ character: \$ $\$$, \{ $\{$, \_ $\_$, etc. If you want \ itself, you should use \backslash (symbol) or \setminus (binary operation) for $\backslash$, because \\ is for a new line.

15. Special characters used for MathJax interpreting can be escaped using the `\` character: `\$` $\\\$$, `\{` $\{$, `\_` $\_$, etc. If you want `\` itself, you should use `\backslash` (symbol) or `\setminus` ([binary operation](https://tex.stackexchange.com/a/511332)) for $\backslash$, because `\\` is for a new line. 

15. Special characters used for MathJax interpreting can be escaped using the \ character: \$ $\$$, \{ $\{$, \_ $\_$, etc. If you want \ itself, you should use \backslash (symbol) or \setminus (binary operation) for $\backslash$, because \\ is for a new line.

To explain:

1. First blockquote is a screenshot of the rendered output of the MathJax tutorial (revision 104) as I see it on my screen.
2. Second blockquote shows the Markdown input used for the portion in the previous screenshot.
3. Third blockquote contains the above Markdown input.
4. Fourth blockquote is a screenshot of the preview (i.e., before submission) of the stuff in 1--3.
5. Fifth blockquote is a screenshot of the rendered output (i.e., after submission) of the stuff in 1--4.

Notice that there is a discrepancy between the preview shown for \$ and its rendered output.

• The Markdown input is "backslash dollar".

  

• The preview displays as "backslash backslash dollar".
• The rendered output is "backslash backslash backslash dollar". Why the discrepancy?