Annals of Mathematical LogicVolume 3, Issue 4, December 1971, Pages 363-394Combinatorics on ideals and forcingAuthor links open overlay panelSerge GrigorieffShow moreShareCitehttps://doi.org/10.1016/0003-4843(71)90011-8Get rights and contentUnder an Elsevier user licenseopen archivePrevious article in issueNext article in issueRecommended articlesCited by (0)Copyright © 1971 Published by Elsevier B.V.