Periodica Mathematica Hungarica

, Volume 6, Issue 4, pp 373–374 | Cite as

Research problems

  • A. Hajnal
  • P. Turán
  • I. Juhász


In this column Periodica Mathematica Hungarica publishes current research problems whose proposers believe them to be within reach of existing methods. Manuscripts should preferably contain the background of the problem and all references known to the author. The length of the manuscript should not exceed two doublespaced type-written pages.


Research Problem Current Research Problem 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. [1]
    P. Erdős, A. Hajnal andR. Radó, Partition relations for cardinal numbers,Acta Math. Acad. Sci. Hungar. 16 (1965), 93–196.MR 34 # 2475Google Scholar
  2. [2]
    V. V. Fedorčuk, On the cardinality of hereditarily separable compacta,Dokl. Akad. Nauk SSSR 222 (1975), 302–305 (in Russian).Google Scholar
  3. [3]
    F. Galvin andS. Shelah, Some counterexamples in the partition calculus,J. Combinatorial Theory Ser. A 15 (1973), 167–174.MR 48 # 8240Google Scholar
  4. [4]
    A. Hajnal andI. Juhász, On hereditarily α-Lindelöf and α-separable spaces, II,Fund. Math. 81 (1973/74), 147–158.MR 49 # 1478Google Scholar
  5. [5]
    A. Hajnal andI. Juhász, On first countable non-LindelöfS-spaces,Infinite and finite sets, Vol. II (Proc. Colloq., Keszthely, 1973), Colloq. Math. Soc. J. Bolyai10, ed. by A. Hajnal, R. Rado, V. T. Sós, North-Holland Publishing Co., Amsterdam-London, 1975, 837–852.Google Scholar
  6. [6]
    I. Juhász, K. Kunen andM. E. Rudin, Two more hereditarily separable non-Lindelöf spaces (to appear).Google Scholar
  7. [7]
    M. E. Rudin, A normal hereditarily separable non-Lindelöf space,Illinois J. Math. 16 (1972), 621–626.MR 46 # 8173Google Scholar
  8. [8]
    A. J. Ostaszewski, On countably compact, perfectly normal spaces,J. London Math. Soc. (to appear).Google Scholar

Copyright information

© Akadémiai Kiadó 1975

Authors and Affiliations

  • A. Hajnal
  • P. Turán
  • I. Juhász

There are no affiliations available

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