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Front Page Publications de l'Institut MathématiquePublisher: Matematički institut SANU, BeogradISSN: 0350-1302Issue: (N.S.) 81 (95)Date: 2007Journal Homepage

Preface 1 - 1
Siniša Crvenković  
Second cohomology and nilpotency class 2 3 - 10
Siniša Crvenković and Vladimir Tasić  
AbstractKeywords: nilpotent groups; Lie algebras; cohomology; projective varietiesMSC: 20J06; 57T10 20F18; 57M05DOI: 10.2298/PIM0795003CZbl: 1186.20034
Eigenvalue Bounds for the Signless Laplacian 11 - 27
Dragoš Cvetković, Peter Rowlinson and Slobodan Simić  
AbstractKeywords: graph theory, graph spectra, line graph, signless LaplacianMSC: 05C50DOI: 10.2298/PIM0795011CZbl: 1164.05038
An Attempt at Frankl's Conjecture 29 - 43
Petar Marković  
AbstractKeywords: Frankl's conjecture, union-closed sets conjectureMSC: 05D05 05A05; 04A20DOI: 10.2298/PIM0795029MZbl: 1246.05004
Sums of Like Powers and some Dense Sets 45 - 52
Žarko Mijajlović, Miloš Milošević and Aleksandar Perović  
AbstractMSC: 11D41 11B05; 11B75; 11Y50DOI: 10.2298/PIM0795045MZbl: 1224.11041
Quadratic Level Quasigroup Equations With Four Variables I 53 - 67
Aleksandar Krapež  
AbstractKeywords: Functional equation, quadratic equation, level equation, Belousov equation, balanced equation, gemini equation, medial equation, general solution, quasigroup, isotopy, quasigroup (left, right) linear over a group, $T$-quasigroup, varietyMSC: 39B52 20N05DOI: 10.2298/PIM0795053KZbl: 1229.39035
Analytic Equivalence of Plane Curve Singularities y^{n}+x^{alpha}y+x^{beta}a(x)=0 69 - 78
A. Lipkovski and V. Stepanović  
AbstractMSC: 14B05 14H20 32S15DOI: 10.2298/PIM0795069SZbl: 1222.14006
On the Eigenvalues of some Class of Pseudo-linear Transformations 79 - 83
Milica Anđelić  
AbstractKeywords: skew polynomials; pseudo-linear transformationsMSC: 15A24 15A04; 15A18; 16S36
Extendable Shelling, Simplicial and Toric h-vector of Some Polytopes 85 - 93
Duško Jojić  
AbstractKeywords: extendable shellability; hypersimplex; toric $h$-vectorMSC: 52B22 52B05DOI: 10.2298/PIM0795085JZbl: 1164.52009
On Regular Anti-congruence in Anti-ordered Semigroups 95 - 102
Daniel Romano  
AbstractKeywords: Constructive mathematics, semigroup with apartness, anti-ordered semigroup, anti-congruence, regular anti-congruence, quasi-antiorderMSC: 03F65 06F05 20M10DOI: 10.2298/PIM0795095RZbl: 1247.03133
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