Numerosities of labelled sets: a new way of counting

Applied non-standard analysis

Gian‐Carlo Rota · Advances in Mathematics · 1978 · 205 citations

Ultrafilters on a countable set

David Booth · Annals of Mathematical Logic · 1970 · 168 citations

Natural Sciences, Mathematics, Set Theory +3

Some points in β<i>N</i>

Kenneth Kunen · Mathematical Proceedings of the Cambridge Philosophical Society · 1976 · 111 citations

Natural Sciences, Mathematics, Probability Theory +13

The Rudin-Keisler ordering of 𝑃-points

Andreas Blass · Transactions of the American Mathematical Society · 1973 · 65 citations · Full text

Natural Sciences, Mathematics, Discrete Mathematics +5

Alpha-theory: An elementary axiomatics for nonstandard analysis

Vieri Benci, Mauro Di Nasso · Expositiones Mathematicae · 2003 · 52 citations

Natural Sciences, Computer Science, Mathematics +5