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This work is part of a project supported by the Deutsche Forschungsgemeinschaft.
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Jäger, G. A well-ordering proof for Feferman's theoryT 0 . Arch math Logik 23, 65–77 (1983). https://doi.org/10.1007/BF02023014
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DOI: https://doi.org/10.1007/BF02023014