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Putting a diamond inside the square
Author(s) -
Rinot Assaf
Publication year - 2015
Publication title -
bulletin of the london mathematical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.396
H-Index - 48
eISSN - 1469-2120
pISSN - 0024-6093
DOI - 10.1112/blms/bdv025
Subject(s) - mathematics , square (algebra) , diamond , geometry , composite material , materials science
By a 35‐year‐old theorem of Shelah,□ λ + ♦ ( λ + )does not imply for regular uncountable cardinals λ . Here, it is proved that□ λ + ♦ ( λ + )is equivalent to for every singular cardinal λ .