Studia Scientiarium Mathematicarum Hungarica 24. (1989)

STUDIA SCIENTIARUM MATHEMATICARUM HUNGARICA A QUARTERLY OF THE HUNGARIAN ACADEMY OF SCIENCES Studia Scientiarum Mathematicarum Hungarlca publishes original papers on mathematics mainly in English, but also in German, French and Russian. Studia Scientiarum Mathematicarum Hungarica is published in yearly volumes of four issues (mostly double numbers published semiannually) by AKADÉMIAI KIADÓ Publishing House of the Hungarian Academy of Sciences H—1054 Budapest, Alkotmány u. 21. Manuscripts and editorial correspondence should be addressed to J. Merza Managing Editor P.O. Box 127 H—1364 Budapest Subscription information Orders should be addressed to KULTUR A Foreign Trading Company P.O. Box 149 H—1389 Budapest or to its representatives abroad. © Akadémiai Kiadó, Budapest

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