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 20.07.2017
Creative Mathematics
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 Print Edition: ISSN 1584 - 286X Online Edition: ISSN 1843 - 441X Creative Math. and Inf. is a category B+ journal in the CNCSIS classification Indexed by: Mathematical Reviews Zentralblatt MATH Current rejection rate: 37.5 % RSS

Vol. 20 (2011), No. 1, 15 March 2011
 Bounded topologies on endomorphism rings Author: Horea F. Abrudan Abstract: We prove in this note that the ring of endomorphisms of an infinite bounded Abelian group admits a nondiscrete right bounded ring topology. We give an example of an Abelian group whose ring of endomorphisms admits both nondiscrete left and right bounded topologies but does not admit a nondiscrete bounded ring topology. PDF | No. of downloads: 150 Attestation of assumptions about random error of the regression model Author: Miriam Andrejiova Abstract: The article deals with the regression model of functional dependency on impact force from height of falling and weight of ram for selected conveyor belt. Main part of the article is devoted to the analysis of random error, mainly verifying the conditions of independence, normality and homoscedasticity of residuals. PDF | No. of downloads: 144 A topological structure on the basins of attraction for iterative methods Author: Gheorghe Ardelean Abstract: In a previous paper we investigated the \emph{left topology} associated to a quasiorder relation (a reflexive and transitive binary relation) on a set. In this work we introduce a topological structure on the basins of attraction of some iterative methods for solving nonlinear equations. Some results obtained in our investigations are presented. PDF | No. of downloads: 153 Mathieu's theorem in the Poincare disc model of hyperbolic geometry Author: Cătălin Barbu Abstract: In this note, we present a proof of Mathieu's hyperbolic theorem in the Poincare disc model of hyperbolic geometry. PDF | No. of downloads: 146 About approximation of $B$-continuous functions of several variables by generalized Boolean sum operators of Bernstein type on a simplex Author: Irina Bârsan / Petru Braica / Mircea Fărcaș Abstract: PDF | No. of downloads: 142 Bounds for the generalized LupaÈ™ functional Author: Hacene Belbachir / Mourad Rahmani Abstract: Upper and lower bounds for the generalized LupaÈ™ functional of n-convex (n-concave) functions are given. PDF | No. of downloads: 148 Two elementary applications of some Presic type fixed point theorems Author: Vasile Berinde / Mădălina Păcurar Abstract: We introduce and illustrate by suitable examples the use of a unified fixed point method for studying the convergence of nonlinear recurrence sequences and for solving cyclic nonlinear systems of equations. Our technique is essentially based on some Presic type fixed point theorems. PDF | No. of downloads: 161 Approximations to the constant e Author: Chao-Ping Chen / Mihaly Bencze Abstract: The main object of this paper is to present new sequences approximating the constant e, which converge faster towards the constant e. PDF | No. of downloads: 147 On AC_I-sets, BC_I-sets, \beta _{I}^{\ast }-open sets and decompositions of continuity in ideal topological spaces Author: Erdal Ekici Abstract: PDF | No. of downloads: 159 The Voronovskaja theorem for some linear positive operators defined by infinite sum Author: Dan Miclăuș / Ovidiu T. Pop Abstract: The main goal of this paper is to establish a Voronovskaja type theorem for the Szasz-Mirakjan-Schurer operators. As a particular case, we get also the Voronovskaja type theorem for the well known Mirakjan-Favard-Szasz operators. PDF | No. of downloads: 152 Integral inequalities via several kinds of convexity Author: M. Emin Ozdemir / Erhan Set / Mohammad Alomari Abstract: Several integral inequalities via some kinds of convexity are obtained. PDF | No. of downloads: 160 A note on the geometry of three circles Author: R. Pacheco / F. Pinheiro / R. Portugal Abstract: In the present note, we deduce some nice results concerning the geometry of three-circles from an easy incidence lemma in plane projective geometry. By particularizing to the case of the three excircles of a triangle, this lemma provides a unified geometric characterization of many interesting Kimberling centers. PDF | No. of downloads: 136 The Pythagorean theorem and area formula for triangles on the plane with generalized absolute value metric Author: Gokhan Soydan / Yusuf Dogru / N. Umut Arslandogan Abstract: In this paper, we first give the Pythagorean theorem on the plane with generalized absolute value metric and show that the converse of the Pythagorean theorem is not true in this plane. Secondly, we give necessary and sufficient conditions for a triangle in this plane to have a right angle. Finally, we give a formula for the area of a triangle on this plane. PDF | No. of downloads: 157 On several new Qi's inequalities Author: Yin Li Abstract: In this paper, we give a simple proof of Qi's inequality and a negative answer to an open problem. PDF | No. of downloads: 138 On Edwards--Child's inequality Author: Yu-Dong Wu / Zhi-Hua Zhang / Zhi-Gang Wang Abstract: PDF | No. of downloads: 159

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