00872nam0-22003011i-450-99000002694040332120041008084002.0000002694FED01000002694(Aleph)000002694FED0100000269420020821d1951----km-y0itay50------baitay-------001yy<<An >>essay in modal logicGeorge h. Von Wright.AmsterdamNorth-Holland publishing company1951VI, 90 p.22 cmStudies in logic and the foundations of mathematicsLogica matematica511.3Von Wright,George H.331531ITUNINARICAUNIMARCBK99000002694040332113 K 61 1223343FINBCFINBCEssay in modal logic107243UNINA