# “Hidden content” in a question

I recently noticed this question: Symmetric Group $$S_n$$ is generated by transpositions. (Here is link to the revision at the time.)

This question looked that way:

I have to proof, that a symmetric group 𝑆𝑛 S n , with n>=2 with support {a1, a2, ... , ap} such that σ(ak)= ak+1 (when k

I started by verifying that σ(1) • (1,2) • σ(2) = (2,3) Transposition. Then by iteration I show that the next Transposition (3,4) = σ(1) • (2,3) • σ(2)... Iterating until Transposition (n,1). after this how can I then proof that 𝑆𝑛 S n is generated by this Transposition?

Thanks!

Note the unfinished sentence at the end of the first paragraph.

However, when I clicked the "edit" button, the end of the first paragraph was there. Why is it not displayed?

• I guess it's because the < is interpreted as an open HTML tag. Not sure why it's not a problem when the question is in edit mode. One way to fix it is to replace the < with an HTML code: &lt;. Of course, LaTeX would be preferable. – Mark McClure Oct 16 '19 at 14:02

When you have k<p the parser breaks down and omits the remainder of the paragraph.

This is one of the main reasons why it is important to properly format questions like this with $$\rm\LaTeX$$.

• I'm not sure about the downvote. Is this disagreement? With what? With the explanation of the behavior, with the behavior itself, or with the suggestion that proper formatting is important in more ways than one? – Asaf Karagila Oct 16 '19 at 14:32
• Maybe someone wants you to recommend MathJax, not LaTeX. – Gerry Myerson Oct 16 '19 at 21:59
• Or maybe someone thinks the parser shouldn't break down. – Peter Phipps Oct 16 '19 at 22:58
• maybe somebody has watched tom scott's video about the self retweeting tweet, and thinks that if the parser can't escape the character, somebody could use a script tag to do remote javascript execution. – user645636 Oct 16 '19 at 23:37
• The obligatory link to an XKCD comic is here. – user1729 Oct 17 '19 at 10:55