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Mathematica MoravicaPublisher: Faculty of Technical Sciences Čačak, University of Kragujevac, ČačakISSN: 1450-5932Issue: 8_1Date: 2004Journal Homepage Editorial BoardImpressum   New Generalizations of Caristi’s Fixed Point Theorem Via Brézis–Browder Principle 1 - 5 Temistocle Bîrsan   AbstractKeywords: fixed point; Caristi’s theorem; Brézis–Browder principle; orbit; lower semicontinuous functionsMSC: 54H25DOI: 10.5937/MatMor0401001B Some Results on Commutativity of Rings 7 - 10 M. S. S. Khan   AbstractKeywords: Commutativity of Rings; Anticommutator; Unital Ring; Torsion Free RingMSC: 16U80 16U90DOI: 10.5937/MatMor0401007K A Note on $\lambda_2$ and $\lambda_n2$ of a Graph 11 - 14 Mirjana Lazić   AbstractKeywords: geometric inequalities; fundamental inequalities of triangle; Gerretsen’s inequalitiesMSC: 51M16DOI: 10.5937/MatMor0401011L Q–analog of Determinant of a Kind of Binomial Coefficient Matrices 15 - 24 Maixue Liu and Zhizheng Zhang   AbstractKeywords: Gaussian binomial coefficient; matrix; determinant; Vandermonde determinant; upper triangular matrixMSC: 05A10; 11B65; 11C20 15A15; 15A36DOI: 10.5937/MatMor0401015L Fixed Points of Some Classes of Nonexpansive Mappings 25 - 31 Branislav Mijajlović   AbstractKeywords: Normed $f_{\lambda}$-orbitally complete spaces with $\lambda$-uniformly convex sphere; Nonexpansive operator; $\lambda$-orbit; Fixed point; Extremal point; Star-shaped setsMSC: 47H10 54H25DOI: 10.5937/MatMor0401025M Stationary Points for Multifunctions on Two Complete Metric Spaces 33 - 38 Valeriu Popa   AbstractKeywords: fixed point; multifunction; implicit relation; complete metric spaceMSC: 54H25DOI: 10.5937/MatMor0401033P Axiom of Choice – 100th Next 39 - 62 Milan Tasković   AbstractDOI: 10.5937/MatMor0401039T On Hyperquasigroups 63 - 71 Janez Ušan and Radoslav Galić   AbstractKeywords: Quasigroups; hypergroupoids; hyperquasigroupsMSC: 20N99 20N05DOI: 10.5937/MatMor0401063U Two Characterizations of (n,m)–groups for $n \geq 3m$ 73 - 78 Janez Ušan and Anita Katić   AbstractKeywords: n–group; (n;m)–groupoid; (n;m)–group; {1; n − m + 1}–neutral operation of the (n;m)–groupoidMSC: 20N15DOI: 10.5937/MatMor0401073U Some Comments on Near–P–polyagroups 79 - 93 Janez Ušan and Mališa Žižović   AbstractKeywords: n–group; {1; n}–neutral operation of the n–groupoid; near–P–polyagroup of the type (s; n − 1)MSC: 20N15DOI: 10.5937/MatMor0401079U

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