MathSciNet bibliographic data MR469756 02K05 (04A20 05C15) Devlin, Keith J.; Shelah, Saharon A weak version of \$\diamondsuit \$$\diamondsuit$ which follows from \$2\sp{\aleph \sb{0}}<2\sp{\aleph \sb{1}}\$$2\sp{\aleph \sb{0}}<2\sp{\aleph \sb{1}}$. Israel J. Math. 29 (1978), no. 2-3, 239–247. Article

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