Preface ......................................................... 1
Sinisa Crvenkovic and Vladimir Tasic:
Second cohomology and nilpotency class 2 ........................ 3
Dragos Cvetkovic, Slobodan Simic, and P. Rowlinson:
Eigenvalue bounds for the signless laplacian ................... 11
Petar Markovic:
An attempt at Frankl's conjecture .............................. 29
Zarko Mijajlovic, Milos Milosevic, and Aleksandar Perovic:
Sums of like powers and some dense sets ........................ 45
Aleksandar Krapez:
Quadratic level quasigroup equations with four variables I ..... 53
A. Lipkovski and V. Stepanovic:
Analytic equivalence of plane curve singularities
yn + xαy + xβA(x) = 0 ........................................... 69
Milica Andelic:
On the eigenvalues of some class of pseudo-linear
transformations ................................................ 79
Dusko Jojic:
Extendable shelling, simplicial and toric h-vector
of some polytopes .............................................. 85
Daniel Abraham Romano:
On regular anti-congruence in anti-ordered semigroups .......... 95
Biljana Janeva, Snezana Ilic, and Vesna Celakoska-
Jordanova:
Canonical biassociative groupoids ............................. 103
Lidija Goracinova-Ilieva and Smile Markovski:
Constructions of (2, n)-varieties of groupoids
for n = 7,8,9 ................................................. 111
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