User:Streetmathematician

Hi, I'm new here. I'm an actual mathematician, but not, at present, an actual street mathematician, though I hope to be one one day.

If you're wondering why I'm editing seemingly random locations in Mexico, please see User:Streetmathematician/The Mexican Grid.

I'm curious about mathematical falsehoods on wikidata: statements which cannot possibly be true, but which the current constraint system seems inadequate at detecting.

For example, many properties are acyclic: if A is B's father, B can't be A's mother, and similarly for any number of intervening generations. (And, yes, there are exceptions in fiction). Shouldn't there be a constraint for those?

As I tinker around with this, I hope to discover (and fix) other minor errors on wikidata. Here are some:

body of water (Q15324) has some statements implying liquid water is the only kind that's meant, but some subclasses made of ice.

is an element of (Q655288) claims to be a relation (Q203066), which claims to be a set (Q36161). In standard set theory, that isn't true.

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