Earthline Journal of Mathematical Sciences 2024-04-11T16:48:55+00:00 Fabiola Malowney Open Journal Systems <p style="text-align: justify;">The Earthline Journal of Mathematical Sciences (E-ISSN: 2581-8147) is a peer-reviewed international journal devoted to publishing original research papers containing substantial contributions in any direction of Pure and Applied Mathematics, Theoretical and Applied Statistics, Theoretical Computer Science, Mathematical Modelling. Applications of Mathematics in Finance and Economics are also welcome.</p> A Note on Summability of Infinite Series 2024-04-07T10:25:39+00:00 Hikmet Seyhan Özarslan Bağdagül Kartal Erdoğan <p>The purpose of the present paper is to get the necessary and sufficient conditions for absolute matrix summability of infinite series.</p> 2024-04-07T00:00:00+00:00 Copyright (c) $K^{th}$-order Differential Subordination Results of Analytic Functions in the Complex Plane 2024-04-07T16:17:12+00:00 Abbas Kareem Wanas Madan Mohan Soren <p>In recent years, there have been many interesting usages for differential subordinations of analytic functions in Geometric Function Theory of Complex Analysis. The concept of the first and second-order differential subordination have been pioneered by Miller and Mocanu. In 2011, the third-order differential subordination were defined to give a new generalization to the concept of differential subordination. While the fourth-order differential subordination has been introduced in 2020. In the present article, we introduce new concept that is the <em>K<sup>th</sup></em>-order differential subordination of analytic functions in the open unit disk <em>U</em>.</p> 2024-04-07T00:00:00+00:00 Copyright (c) Fixed Point Theorems in Extended Convex Quasi s-metric Spaces 2024-04-08T17:33:21+00:00 Qusuay H. Alqifiary <p>In this work, through the convex structure, we introduce the concept of the extended convex quasi <em>s</em>-metric spaces. In addition, through Mann's iterative technique, we theorize the existence of a unique fixed point for two types of contraction mapping in extended convex quasi <em>s</em>-metric spaces.</p> 2024-04-08T00:00:00+00:00 Copyright (c) A Mathematical Logistic Model Describes Both Global CO2 Emissions and its Accumulation in the Atmosphere 2024-04-11T16:48:55+00:00 Salvatore Mazzullo <p>A single kinetic model, of a logistic nature, is able to describe two different phenomena: the global emission of CO<sub>2</sub> due to the combustion of fossil fuels and the observed accumulation of CO<sub>2</sub> in the atmosphere. Unexpectedly, the analysis of the experimental data clearly shows that the two rates of emission and accumulation are almost exactly in phase and differ by a constant factor. The fraction of CO<sub>2</sub> that accumulates in the atmosphere is constantly equal to 65% of the emissions. The same percentage also applies to the rate of change of the two phenomena, i.e., the accelerations.</p> 2024-04-11T00:00:00+00:00 Copyright (c)