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https://mathoverflow.net/questions/508654/a-weak-lozenge-principle
set theory - A weak $\lozenge$ principle - MathOverflow
(This is probably unrelated to Devlin-Shelah's weak diamond principle $\Phi$, but I didn't know what else to call it.) Say a sequence $\vec{A} = \langle...
set theoryweaklozengeprinciplemathoverflow