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After posting this question I sent the corresponding URL via email to somebody. In the meantime a user has edited the headline of my question which rendered my old link invalid. I used the URL in my webbrowser which was https://math.stackexchange.com/questions/3225a642/g-is-an-abelian-group-and-a-permutation-t-suppose-that-x-tx-neq-y-ty/3225753

As a result the person I sent it to had no chance to read the post.

A solution would be to still accept the old url after the edit.

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    $\begingroup$ The link which you have in the post (in the first revision) is invalid probably because you edited it by mistake. To be more specific, you are linking to question 3225a642 which does not work (there is no such question), but the link to question 3225642 does work. $\endgroup$ – Martin Sleziak May 17 at 13:47
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You have put a in the middle of the question identifier (that number after /questions/ in the URL), which is why the link didn't work.

The link itself only depends on that number, so you can even use https://math.stackexchange.com/questions/3225642/this-can-be-anything-really-it-doesnt-matter, and it would work just fine.

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