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This research has been partially supported by NSF grant GP21067. Theorem 2 and Theorem 5 appeared earlier in [8]. We have also benefited from a grant of the C.N.R. (Italy).
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Jeroslow, R.G. Experimental logics and Δ sup0inf2 - theories. J Philos Logic 4, 253–267 (1975). https://doi.org/10.1007/BF00262039
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DOI: https://doi.org/10.1007/BF00262039