All issues
20.07.2017   
Creative Mathematics
and Informatics



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 %


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Vol. 14 (2005),
The integer part of some terms of a sequence of real numbers
Author: Dumitru Acu
Abstract: In this paper we generalize some problems concerning the integer part of some terms of particular sequences of real numbers.
PDF | DVI | PS |
No. of downloads: 541 Full access PDF |
About some new means
Author: Mihaly Bencze
Abstract: In this paper we introduce some new means, which give new refinements for Arithmetic Mean-Geometric Mean-Harmonic Mean [AM-GM-HM] inequalities.
PDF | DVI | PS |
No. of downloads: 500 Full access PDF |
Modelling quaternions
Author: Peter Kortesi
Abstract: The Hamilton quaternions are usually introduced as generalisation of complex numbers respecting the basic identities. We present a way to use matrices to introduce quaternions and study their properties, using an isomorphism between the two structures.
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No. of downloads: 697 Full access PDF |
Mathematical induction: Notes for teacher (part1)
Author: Michael Lambrou
Abstract: This set of notes is aimed at the teacher of the gifted student who wishes to be exposed to less routine techniques of induction than normally found in a standard school textbook.
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No. of downloads: 437 Full access PDF |
On the convergence of a sequence generated by an integral
Author: Marcelina Mocanu / Adrian Sandovici
Abstract: Some results concerning the convergence of some sequences generated by integrals are presented. Immediate applications are also given.
PDF | DVI | PS |
No. of downloads: 563 Full access PDF |
On the limits of some sequence of integrals
Author: Nicolae Mușuroia
Abstract: The aim of this paper is to give two general results regarding the computation of some particular limits of real sequences which are defined by a definite integral (Proposition 1 and Proposition 2). Several applications are then presented.
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No. of downloads: 458 Full access PDF |
About some mean-value theorems
Author: Ovidiu T. Pop
Abstract: Is this note we will demonstrate a mean-value theorem (Theorem 3), from which through several particularizations, we will obtain the mean-value theorem of Dimitrie Pompeiu and the mean-value theorem of Mircea Ivan. We will also give a geometrical interpretation of Theorem 3.
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No. of downloads: 506 Full access PDF |
About Bernsteim polynomial and the Stirling's numbers of second type
Author: Ovidiu T. Pop / Mircea Farcas
Abstract:
PDF | DVI | PS |
No. of downloads: 556 Full access PDF |
A method to determine all non-isomorphic groups of order 12
Author: Dumitru Valcan
Abstract: The present work gives a method to determine of all non-isomorphic groups of order 12 and gives descriptions of all these groups.
PDF | DVI | PS |
No. of downloads: 447 Full access PDF |
The estimation of the accuracy of an indicator in
Author: Cristian Marinoiu
Abstract: Often, the researcher in educational testing theory, would like to have a model that simply explains the obtained scores. In order to establish if such a model is adequate, an indicator based on the eigenvalues of the empirical covariance matrix of the scores is used. This paper presents the standard methodology to construct this indicator, its bootstrap estimate of the standard error and its percentile bootstrap confidence interval. Finally, for a case study, a program that implements in Matlab the described algorithm provides the desired results.
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No. of downloads: 452 Full access PDF |
A better grading of the student's performance using the first principal
Author: Cristian Marinoiu / Iuliana Dobre
Abstract: In this paper we describe an application of the first principal component of the empirical covariance matrix of the scores in educational testing theory. An algorithm for better grading the students' performance is implemented in Matlab and the results are provided.
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No. of downloads: 145 Full access PDF |
On the spline and B-spline approximation of a function
Author: Magnolia Rebeles
Abstract: The functions are main mathematical main tools in describing and analyzing physical processes and phenomena in nature. Only in a few cases the functions modeling these phenomena are known explicitly, in the most of the cases there are used approximations. In this paper the power of the spline and B-spline approximation for a given function is presented. A code algorithm generates a table in which the values of these two approximations can be compared. The purpose of this utility programme is to be a didactic tool on how the B-spline functions perform a better approximation than the spline functions.
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No. of downloads: 514 Full access PDF |
Analysis of duration and convexity of coupon obligation
Author: Vincent Soltes / Michael Soltes
Abstract: Duration and convexity of coupon bonds are analysed in this paper. There is derived new formula for duration of the coupon bonds. The proof is based on the calculation of the sum some special sequences without using derivation and integration.
PDF | DVI | PS |
No. of downloads: 454 Full access PDF |
A Java implementation of the SPIHT coder
Author: Ovidiu Cosma / Vasile Lupșe
Abstract: This article presents a Java implementation of one of the best coding algorithms for the subbands of images. The SPIHT (Set Partitioning in Hierarchical Trees) algorithm performs a progressive coding of the transformed images, speculating the correlation between the DWT coefficients, with a data structure called zerotree.
PDF | DVI | PS |
No. of downloads: 433 Full access PDF |
Optimal values in structures with pseudo-random generated elements
Author: Camelia Mihaela Pintea
Abstract: We propose structures with recurrent and random values. These values are called pseudo-random values. The goal is to find the optimal values for the pseudo-random values of dynamic lists, character strings and numerical sequences.
PDF | DVI | PS |
No. of downloads: 471 Full access PDF |
Some methods for composing problems in mathematics
Author: Radu Bairac
Abstract: The article sustains the idea that the mathematics education should be performed as a continuous research and discovery, not just as a simple transmission of already known ideas. An essential contribution to this activity would be the invention of new mathematical problems. Here are some methods: paraphrasing, changing of statement's data, analogy, generalization, combination.
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No. of downloads: 435 Full access PDF |
Richard Dedekind's theory of sets
Author: Lech Gruszecki
Abstract: In this paper a short outline of Richard Dedekind's theory of sets is given.
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No. of downloads: 404 Full access PDF |
About generalization in mathematics (Part 1)
Author: Gheorghe Miclăuș
Abstract: In this paper we present the importance of generalization in the didactics of Mathematics with an illustration starting from a problem given at a mathematics competition.
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No. of downloads: 463 Full access PDF |
The method of characteristic values in testing mathematical models
Author: Istvan Huba Atilla Sass
Abstract: Mathematical modeling of natural phenomena is frequently used by scientists. Since mathematical models usually involve laborious computation, there is a real need for shortcut methods testing the suitability of the chosen model in an early stage of the modeling. In this paper we present and illustrate such a method, namely the method of characteristic values.
PDF | DVI | PS |
No. of downloads: 398 Full access PDF |
Mathematical excursions in fractal world
Author: Anna Soos
Abstract: In this article we will rewiev the existence and uniqueness results for fractal sets. The fractals are sets having noninteger Hausdorff dimensions. In selfsimilar case this dimension can be calculated using the similarity dimension.
PDF | DVI | PS |
No. of downloads: 437 Full access PDF |


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