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Publications de l'Institut MathématiquePublisher: Matematički institut SANU, BeogradISSN: 0350-1302Issue: (N.S.) 45 (59)Date: 1989Journal Homepage Editorial BoardImpressum   A Proof Procedure for the First Order Logic 3 - 5 Miodrag Kapetanović and Aleksandar Krapež   AbstractMSC: 03B10 03F07 Maximal Canonical Graphs with Three Negative Eigenvalues 7 - 10 Aleksandar Torgašev   AbstractMSC: 05C50 Perfect Matchings in a Class of Bipartite Graphs 11 - 15 Ivan Gutman   AbstractMSC: 05C70 Order Preserving or Increasing Mappings Freedom or Incomparability Preserving Mappings 17 - 26 Đuro Kurepa   AbstractMSC: 06A10 05C05 Large Subalgebras of a Boolean Algebra 27 - 31 Slobodan Vujošević   AbstractMSC: 06E05 On Categories of Relations 33 - 40 Mara Alagić   AbstractKeywords: category with pullbacks, functor-category, natural transformation, symmetrizations of categories, involution.MSC: 18B99 08A08 18D99 On Sums Involving Reciprocals of Certain Large Additive Functions 41 - 55 Tizuo Xuan   AbstractMSC: 10H25 On some Generalized Inverses of Matrices and some Linear Matrix Equations 57 - 63 Jovan D. Kečkić   AbstractMSC: 15A09 15A24 On Regular Rings and Self-injective Rings, iv 65 - 72 Roger Yue Chi Ming   AbstractMSC: 16A30 16A52 16A36 16A50 On P-groups of Small Order 73 - 76 Theodoros Exarchakos   AbstractMSC: 20D15 20D45 Article page: 123>>

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