Thanks for reporting this!
Here's a fix: https://github.com/metamath/set.mm/pull/2696 -
assuming this is approved and merged it should be on the website a
day or two after it is merged.
The Law of identity link in https://us.metamath.org/mpeuni/mmset.html#theorems links to id1, which says
> If you landed here, please let the originating site and/or us know that the link that made you land here should be changed to a link to idALT. --
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