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101 0 $aeng
200 1 $a<<The >>unprovability of consistency$eAn Essay in Modal Logic$fGeorge Boolos
210   $aLondon [etc.]$cCambridge University Press$d1979
215   $aviii, 184 p.$d22 cm
610 0 $aLogica
610 0 $aRicorsività
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996   $aUnprovability of consistency$9358767
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