Published: 1981 Received: April 24, 1979Available on J-STAGE: October 20, 2006Accepted: -
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Date of correction: October 20, 2006Reason for correction: -Correction: CITATIONDetails: Wrong : 1) H. Cartan and S. Eilenberg, Homological Algebra, Princeton, 1956. 2) P. Cartier, The groups Exts(A, B), Séminaire A. Grothendieck (Algebre Homologique), 1956/57. 3) P. J. Hilton and D. Rees, Natural maps of extension functors and a theorem of R. G. Swan, Proc. Cambridge Philos. Soc., 57 (1961), 489-502. 4) S. MacLane, Homology, Springer Verlag, 1963. 5) N. Yoneda, Notes on products in Ext, Proc. Amer. Math. Soc., 9 (1958), 873-875.
Right : [1] H. Cartan and S. Eilenberg, Homological Algebra, Princeton, 1956. [2] P. Cartier, The groups Exts(A,B), Séminaire A. Grothendieck (Algebre Homologique), 1956/57. [3] P. J. Hilton and D. Rees, Natural maps of extension functors and a theorem of R. G. Swan, Proc. Cambridge Philos. Soc., 57 (1961), 489-502. [4] S. MacLane, Homology, Springer Verlag, 1963. [5] N. Yoneda, Notes on products in Ext, Proc. Amer. Math. Soc., 9 (1958), 873-875.
Date of correction: October 20, 2006Reason for correction: -Correction: PDF FILEDetails: -