Topic on User talk:M2k~dewiki

Thanks for the welcome message. I'm wikipedian since the first hour but new to wikidata. I like the idea and will try to contribute to my areas of expertise (science & math in particular). I asked a question at Talk:Q49008#circular defining formula and will also ask one about "set of prime numbers": There's written "opposite of: set of composite numbers". The mathematical meaning of "opposite" is additive inverse, so the opposite of the set of prime numbers is {-2, -3, ...}. Even if we consider "opposite" in the logical sense, it is incorrect that the opposite of "prime" is composite: e.g. the number 1 is neither prime nor composite. Similarly for zero and negative and all non integral numbers.— Thanks in advance for any useful advice! – ~~~~

Hello @MFH: questions could be posted at Wikidata:Project chat (en) or Wikidata:Forum (de), questions regarding the property "formula" at Property talk:P2534.