I noticed that in some posts, the code of the equations ends with "\:.", but nor "\:", nor ":" themselves appear in the rendered equation (see, e.g., this answer). However, if I copy-paste such an equation, e.g.

$$V(t)U_t = U_t V(0) \quad \forall t \in \mathbb R\:,\tag{1}$$

into the editor of a new question, ":" is shown literally also in the rendered equation seen below the editor window. I see that "\:" represents a kind of space character, but why does it behave differently when I edit a post or add a question?

(I noticed also that in this question, the MathJax code isn't processed at all. Why?)



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