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Safra Campus, Givat Ram Jerusalem 9190401 Israel"},{"name":"Department of Mathematics Rutgers, The State University of New Jersey Hill Center\u2014Busch Campus, 110 Frelinghuysen Road Piscataway NJ 08854\u20108019 United States of America"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2019,12,16]]},"reference":[{"key":"e_1_2_4_2_1","volume-title":"Model Theory","author":"Chang C. C.","year":"1990"},{"key":"e_1_2_4_3_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-642-65780-1"},{"key":"e_1_2_4_4_1","volume-title":"Algebra in the Stone\u2010\u010cech Compactification","author":"Hindman N.","year":"2012"},{"key":"e_1_2_4_5_1","first-page":"162","volume-title":"Ultrafilter Extensions of Models","author":"Saveliev D. I.","year":"2011"},{"key":"e_1_2_4_6_1","first-page":"599","volume-title":"The Infinity Project, A 2009\u20132011 Research Programme","author":"Saveliev D. 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