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Two ideals
Authors:Ilijas Farah  Slawomir Solecki
Institution:Department of Mathematics, CUNY, Graduate Center and College of Staten Island, Staten Island, New York 10314 -- and -- Matematicki Institut, Kneza Mihaila 35, Belgrade, Serbia ; Department of Mathematics, 1409 W. Green Street, University of Illinois, Urbana, Illinois 61801
Abstract:We find two $F_{\sigma\delta}$ ideals on $\mathbb N$ neither of which is $F_\sigma$whose quotient Boolean algebras are homogeneous but nonisomorphic. This solves a problem of Just and Krawczyk (1984).

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