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"The error function takes place in a wide range in the elds of mathe- matics, mathematical physics and natural sciences. The aim of the current paper is to investigate certain properties such as univalence and close-to-convexity of normalized imaginary error function, which its region is symmetric with respect to the real axis. Some other outcomes are also obtained."

Contemporary learning processes in schools and universities could not be imagined without the use of computers and calculators. Naturally, all is good if they are used in order to acquire new knowledge or solve problems from expert subjects in technical schools, which demand large quantity of simple mathematical operations. However, what if frequent use of calculators, either pocket or those installed on every home and school computer, becomes an addiction in students who begin using them while calculating simple mathematical operations, such as multiplying or adding and detracting one-digit numbers or numbers smaller than 20, when they should know this by heart? We arrived at this hypothesis during knowledge tests for students after regular demonstrations and elaborations of Mathematics subject matter. In order to confirm or deny this hypothesis, generic/developmental method, that is, survey was used as one of research techniques (Selimović, 2013., p. 104). The survey was conducted in March during academic 2016/2017 and the sample consisted of 59 students in 2nd grade of Grammar School Tešanj.

The aim of this work is toresearch does exist a fear of mathematics, what are the causes of fear of mathematics, in what forms fear is manifested and what parents do to repress a fear of mathematics at students in higher grades of elementary school. For the purposes of the research, two separate scales were created which measured the fear of mathematics at students from the perspective of parents and students. The research was conducted in the elementary schools in Central Bosnia with students of fifth, sixth, seventh, eighth and ninth grades. We leave the survey questionnaire at the end, in attachment, so that it can be viewed. Analysis or data processing we worked and we got results which we´ve presented in this work. There shouldn´t be fear in the teaching process.Students shouldn´t come to school under pressure or in fear, but should find ways to motivate themselves to work because of their personal progress and training for life. Parents and teachers help them with that. Achievements in mathematics are researched more than achievements in other subjects because mathematics is important for researching and comparing different educational systems.Because of this importance, we need to find ways to repress the students 'fear of math.Students, except motivation for working, should give encouragement and support. Communication with the child, and communication in the parent-school-student relationship is very important in repressing the child's fear

"In this paper, we introduce the concept of triangular ideal relative convergence for double sequences of functions defined on a modular space. Based upon this new convergence method, we prove Korovkin theorems. Then, we con- struct an example such that our new approximation results work. Finally, we discuss the reduced results which are obtained by special choices. Keywords: Positive linear operators, the double sequences, triangular ideal relative modular convergence, Korovkin theorem."

The notions of strong differential subordination and superordination have been studied recently by many authors. In the present paper, using these concepts, we obtain some preserving properties of certain nonlinear integral operator defined on the space of normalized analytic functions in $\mathbb{D}\times\overline{\mathbb{D}}$. The sandwich-type theorems and consequences of the main results are also considered.

In addition to a great variety of degree-based and distance-based molecular structure descriptors, there are a few degree-and-distance-based topological indices. Two main such indices are the degree distance (DD) and the Gutman index (ZZ). Their mutual relations are analyzed and several new such relations established. It is shown that by conveniently chosen linear combinations of DD, ZZ and the Wiener index, it is possible to calculate several chemically interesting structural properties of molecular graphs.

The inorganic montmorillonitic clay material in raw and modified forms (sodic and fractionated, sodic materials) was evaluated as adsorbent for anionic textile dye (Nylosan Red N-2RBL). A various characterization using XRD, XRF, AFM, FTIR, TG, adsorption of methylene blue and pHPCN of the considered samples was realized. The experimental results show that, the adsorption was pH dependent with a high adsorption capacity of NR dye in acidic range. The pseudo-second-order kinetic model provided the best fit to the experimental data for the adsorption of dye by clay materials. The equilibrium adsorption data were analyzed by Langmuir, Freundlich and Dubinin–Radushkevich isotherm models. The best fit of experimental data was obtained by the Dubinin–Radushkevich isotherm model. The maximum adsorption capacity of the raw clay calculated by the latest isotherm model is 62.05 mg/g. It is increased in modified forms (170.11 and 201 mg/g for sodic clay and fractionated sodified clay materials, respectively). Increasing solution ionic strength (NaCl, KCl, NaNO3, and Na2SO4) increased significantly the adsorption of dye.