Category:Pages using Math with unknown parameters

Note: the following code habit is not an error.


 * is not an error, and should be left unedited.


 * In code:
 * Text shown: "... the indices can range over the set ${1, 2, 3}$"

The extra pipe symbol in  is unused but does not corrupt the math text. It helps understanding the input text (distinguishing the various }-symbol).

It produces a categorisation here, and a Warning: "". However, since it is helpful, it is not an error, and it should not be edited out. , 18 articles are listed with this feature.