# Migrated question has no tags

I just noticed a question that was migrated from physics to math: https://math.stackexchange.com/q/906188/101979

When it arrived on the math site, it appeared to have no tags. I assume that the tags used on the physics site didn't exist on the math site. It seems strange that a question can exist with no tags.

Is this a bug? A feature? Not worth worrying about?

• I just looked at it again, and it appears to have the tag "integration". I don't know if I just didn't see it before (because tag formatting is different on math site) or whether it just got added...? – Floris Aug 22 '14 at 17:08

• You must be right - would you suggest that I delete my question? Strange though that the homework tag (which was added in rev 2) disappeared during the migration. What would have happened if the only tags used did not exist on the new site? Would they be created by the process of migration? – Floris Aug 22 '14 at 17:30