I insist. That kind of sentence is wrong. In FOL + ZFC we can express the least-upper-bound property for real numbers. Maybe in FOL+ Real if Real is a system of axioms of real numbers we cannot. But at last we must stop giving this kind of example without specifying the axiomatic added to FOL.
Ah! Yes. They specify the area. But it's barely visible, and even less decodable. -- FL -- You received this message because you are subscribed to the Google Groups "Metamath" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/metamath/91ca6a69-2608-437f-923b-5caf65a6fb73%40googlegroups.com.
