Studia Scientiarium Mathematicarum Hungarica 26. (1991)

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STUDIA SCIENTIARUM MATHEMATICARUM HUNGARICA A QUARTERLY OF THE HUNGARIAN ACADEMY OF SCIENCES Studia Scientiarum Mathematicarum Hungarica 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—1117 Budapest, Prielle Kornélia u. 19—35. 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 AKADÉMIAI KIADÓ P.O. Box 245 H—1519 Budapest or to its representatives abroad. © Akadémiai Kiadó, Budapest