relation: https://pure.iiasa.ac.at/id/eprint/4325/ title: A philosopher's mathematician: Hans Hahn and the Vienna Circle creator: Sigmund, K. publisher: Springer date: 1995 type: Article type: PeerReviewed identifier: Sigmund, K. (1995). A philosopher's mathematician: Hans Hahn and the Vienna Circle. Mathematical Intelligencer 16-29.