I have just asked a question and wanted to add tag "conditional-probability"(x 841), but the tag doesn't appear without any notification. Is there any restrictions on using some tags?
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conditional-probability is a synonym of probability, so if you add that tag to a question, it is automatically converted to probability. The tags were not merged when the synonym was created, therefore there are still questions having the tag conditional-probability.
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$\begingroup$ Thank you! Can I read somewhere which tags are synonyms? $\endgroup$ – Slowpoke Jun 3 '16 at 12:50
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5$\begingroup$ Yes, you can. There's a tag synonyms page (linked at the bottom of the tags page). But let me warn you, that page is ugly. Also, it's hard to interpret. $\endgroup$ – Daniel Fischer♦ Jun 3 '16 at 12:52
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$\begingroup$ There is now a separate discussion whether or not there should be this tag synonym: math.meta.stackexchange.com/questions/27653/tag-management-2018/… $\endgroup$ – Martin Sleziak Jul 24 '18 at 4:51