%0 Book Section %A Sigmund, K. %B The Foundational Debate Complexity and Constructivity in Mathematics and Physics %D 1995 %E DePauli-Schimanovich, W. %E Köhler, E. %E Stadler, F. %F iiasa:4227 %I Springer %N 3 %P 235-245 %S Vienna Circle Institute Yearbook %T Hans Hahn and the foundational debate %U https://pure.iiasa.ac.at/id/eprint/4227/