Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleFactual impossibility and concomitant variations.AuthorsFlew, AntonyPublicationBehavioral & Brain Sciences, 1987, Vol 10, Issue 4, p586ISSN0140-525XPublication typeArticleDOI10.1017/S0140525X00054674