Ultrafilter extensions do not preserve elementary equivalence
Abstract
We show that there exist models M1 and M2 such that M1 elementarily embeds into M2 but their ultrafilter extensions β( M1) and β( M2) are not elementarily equivalent.
0
Turn this paper into a lesson
ArcXiv compiles a structured reading guide from this paper's metadata: plain-English importance, contributions, prerequisite concepts, which sections to read first, flashcards, and a quiz. Grounded in the abstract, never invented.