Hajnal, A.; Szemerédi, E. (1970), "Proof of a conjecture of P. Erdős", Combinatorial theory and its applications, II (Proc. Colloq., Balatonfüred, 1969), North-Holland, pp. 601–623, MR0297607
Baumgartner, J.; Hajnal, A. (1973), "A proof (involving Martin's axiom) of a partition relation", Fundamenta Mathematicae, 78 (3): 193–203, doi:10.4064/fm-78-3-193-203, MR0319768. For additional results of Baumgartner and Hajnal on partition relations, see the following two papers: Baumgartner, J. E.; Hajnal, A. (1987), "A remark on partition relations for infinite ordinals with an application to finite combinatorics", Logic and combinatorics (Arcata, Calif., 1985), Contemp. Math., vol. 65, Providence, RI: Amer. Math. Soc., pp. 157–167, doi:10.1090/conm/065/891246, ISBN978-0-8218-5052-7, MR0891246; Baumgartner, James E.; Hajnal, Andras (2001), "Polarized partition relations", The Journal of Symbolic Logic, 66 (2), Association for Symbolic Logic: 811–821, doi:10.2307/2695046, JSTOR2695046, MR1833480, S2CID28122765
The announcementArchived 2008-07-24 at the Wayback Machine for the 2001 conference in honor of Hajnal and Sós calls him “the great chess player”; the conference included a blitz chess tournament in his honor.
Baumgartner, J.; Hajnal, A. (1973), "A proof (involving Martin's axiom) of a partition relation", Fundamenta Mathematicae, 78 (3): 193–203, doi:10.4064/fm-78-3-193-203, MR0319768. For additional results of Baumgartner and Hajnal on partition relations, see the following two papers: Baumgartner, J. E.; Hajnal, A. (1987), "A remark on partition relations for infinite ordinals with an application to finite combinatorics", Logic and combinatorics (Arcata, Calif., 1985), Contemp. Math., vol. 65, Providence, RI: Amer. Math. Soc., pp. 157–167, doi:10.1090/conm/065/891246, ISBN978-0-8218-5052-7, MR0891246; Baumgartner, James E.; Hajnal, Andras (2001), "Polarized partition relations", The Journal of Symbolic Logic, 66 (2), Association for Symbolic Logic: 811–821, doi:10.2307/2695046, JSTOR2695046, MR1833480, S2CID28122765
Foreman, M.; Hajnal, A. (2003). "A partition relation for successors of large cardinals". Mathematische Annalen. 325 (3): 583–623. doi:10.1007/s00208-002-0323-7. S2CID120500400.
Baumgartner, J.; Hajnal, A. (1973), "A proof (involving Martin's axiom) of a partition relation", Fundamenta Mathematicae, 78 (3): 193–203, doi:10.4064/fm-78-3-193-203, MR0319768. For additional results of Baumgartner and Hajnal on partition relations, see the following two papers: Baumgartner, J. E.; Hajnal, A. (1987), "A remark on partition relations for infinite ordinals with an application to finite combinatorics", Logic and combinatorics (Arcata, Calif., 1985), Contemp. Math., vol. 65, Providence, RI: Amer. Math. Soc., pp. 157–167, doi:10.1090/conm/065/891246, ISBN978-0-8218-5052-7, MR0891246; Baumgartner, James E.; Hajnal, Andras (2001), "Polarized partition relations", The Journal of Symbolic Logic, 66 (2), Association for Symbolic Logic: 811–821, doi:10.2307/2695046, JSTOR2695046, MR1833480, S2CID28122765
Baumgartner, J.; Hajnal, A. (1973), "A proof (involving Martin's axiom) of a partition relation", Fundamenta Mathematicae, 78 (3): 193–203, doi:10.4064/fm-78-3-193-203, MR0319768. For additional results of Baumgartner and Hajnal on partition relations, see the following two papers: Baumgartner, J. E.; Hajnal, A. (1987), "A remark on partition relations for infinite ordinals with an application to finite combinatorics", Logic and combinatorics (Arcata, Calif., 1985), Contemp. Math., vol. 65, Providence, RI: Amer. Math. Soc., pp. 157–167, doi:10.1090/conm/065/891246, ISBN978-0-8218-5052-7, MR0891246; Baumgartner, James E.; Hajnal, Andras (2001), "Polarized partition relations", The Journal of Symbolic Logic, 66 (2), Association for Symbolic Logic: 811–821, doi:10.2307/2695046, JSTOR2695046, MR1833480, S2CID28122765
Foreman, M.; Hajnal, A. (2003). "A partition relation for successors of large cardinals". Mathematische Annalen. 325 (3): 583–623. doi:10.1007/s00208-002-0323-7. S2CID120500400.
The announcementArchived 2008-07-24 at the Wayback Machine for the 2001 conference in honor of Hajnal and Sós calls him “the great chess player”; the conference included a blitz chess tournament in his honor.