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  1. (1 other version)The Existence of Level Sets in a Free Group Implies the Axiom of Choice.Paul E. Howard - 1987 - Mathematical Logic Quarterly 33 (4):315-316.
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  • Subgroups of a free group and the axiom of choice.Paul E. Howard - 1985 - Journal of Symbolic Logic 50 (2):458-467.
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  • (1 other version)The Existence of Level Sets in a Free Group Implies the Axiom of Choice.Paul E. Howard - 1987 - Zeitschrift fur mathematische Logik und Grundlagen der Mathematik 33 (4):315-316.
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