6 ms·

Silly question, but what do you mean when you type "ZF"?

• aaaaaaaaaab 8y ago
  https://en.m.wikipedia.org/wiki/ZF_Friedrichshafen https://en.m.wikipedia.org/wiki/ZF_Friedrichshafen
• deleted 8y ago
  [deleted]
• bmurray7jhu 8y ago
  Zermelo–Fraenkel set theory?