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  1. A note on the deductive strength of the Nielsen‐Schreier theorem.Eleftherios Tachtsis - 2018 - Mathematical Logic Quarterly 64 (3):173-177.
    We show that the Boolean Prime Ideal Theorem () does not imply the Nielsen‐Schreier Theorem () in, thus strengthening the result of Kleppmann from “Nielsen‐Schreier and the Axiom of Choice” that the (strictly weaker than ) Ordering Principle () does not imply in. We also show that is false in Mostowski's Linearly Ordered Model of. The above two results also settle the corresponding open problems from Howard and Rubin's “Consequences of the Axiom of Choice”.
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