**About the Editors**

**Lorentz J ¨antschi** was born in Fag˘ aras ˘ , , Romania, in 1973. In 1991 he moved to Cluj-Napoca, Cluj, where he completed his studies. In 1995 he was awarded a B.Sc. and M.Sc. in Informatics, in 1997 a B.Sc. and M.Sc. in Physics and Chemistry, in 2000 a Ph.D. in Chemistry under the supervision of Prof. Mircea V. Diudea, in 2002 an M.Sc. in Agriculture, in 2010 a Ph.D. in Horticulture under the supervision of Prof. Radu E. Sestras, , and, finally, in 2013 a postdoctorate in Horticulture. That same year (2013), he became a Full Profesor of chemistry at the Technical University of Cluj-Napoca and an associate at Babes-Bolyai University, where he advises Ph.D. studies in chemistry. Both positions are to date. During the time he had research and education activities deployed under auspices of different institutions: the G. Barit ,iu (1995–1999) and Balcescu (1999–2001) National Colleges, the Iuliu ˘ Hat ,ieganu University of Medicine and Pharmacy (2007–2012), Oradea University (2013–2015), and the Institute of Agricultural Sciences and Veterinary Medicine at University of Cluj-Napoca (2011–2016). He serves as an editor for the journals Notulae Scientia Biologicae, Notulae Horti Agro Botanici Cluj-Napoca, Open Agriculture and Symmetry. He was Editor-in-Chief of the Leonardo Journal of Sciences and the Leonardo Electronic Journal of Practices and Technologies (2002–2018) and gues<sup>t</sup> editor (2019–2020) for Mathematics.

**Sorana D. Bolboac ˘a** is a professor of medical informatics and biostatistics at the "Iuliu Hat,ieganu" University of Medicine and Pharmacy Cluj-Napoca, Romania. She earned her Ph.D. in Medicine (2006) from the Iuliu Hat¸ieganu University of Medicine and Pharmacy (thesis title: "Evidence-Based Medicine: Logistics and Implementation") and a Ph.D. in Horticulture (2010) from the University of Agriculture Sciences and Veterinary Medicine Cluj-Napoca (thesis title: "Statistical Models for Analysis of Genetic Variability"). Her research interests are multidisciplinary, e.g., applied & computational statistics, molecular modeling, genetic analysis, statistical modeling in medicine, integrated health informatics system and application of new technologies in medicine, medical diagnostics research, medical imaging analysis, assisted decision systems, research ethics, social media and health information, and evidence-based medicine. She is an active member of the scientific community with more than 200 papers and 19 monographs as well as editorial and reviewing activities (https://publons.com/researcher/249582/sorana-d-bolboaca/).

## **Preface to "Symmetry in Applied Mathematics"**

The Symmetry in Applied Mathematics special issue of Symmetry Journal reprinted here is collecting fourteen papers dealing with various subjects under the auspices of using symmetry for solving problems. The special issue called for articles from a broad interdisciplinary area, since 'applied mathematics' is a specific form of mathematics that involves creating and use of mathematical models to map out the mathematical core of a practical problem. There is probably no scientific field in which applied mathematics has not made its necessary presence. On the other hand, symmetry is about identification and use invariants to any of various transformations for any paired dataset and characterizations associated with. Inside applied mathematics, symmetry may work as a powerful tool for problems reduction and solving. Applications include probability theory (all probabilistic reasoning is ultimately based on judgments of symmetry), fractals (geometry), supersymmetry (physics), nanostructures (chemistry), taxonomy (biology), bilateral symmetry (medicine), and the list can go on. The call for papers was closed on November 15, 2019. The papers reports from mathematical theoretical results (Khovanov Homology of Three-Strand Braid Links https://www.mdpi.com/2073-8994/10/12/720, Volume Preserving Maps Between p-Balls https://www.mdpi.com/2073-8994/11/11/1404, Generation of Julia and Mandelbrot Sets via Fixed Points https://www.mdpi.com/2073-8994/12/1/86) applications in physics or chenistry (A Continuous Coordinate System for the Plane by Triangular Symmetry https://www.mdpi.com/2073-8994/11/2/191, One-Dimensional Optimal System for 2D Rotating Ideal Gas https://www.mdpi.com/2073-8994/11/9/1115, Minimal Energy Configurations of Finite Molecular Arrays https://www.mdpi.com/2073-8994/11/2/158), designing of the algorithms and their efficiency (Noether-Like Operators and First Integrals for Generalized Systems of Lane-Emden Equations https://www.mdpi.com/2073-8994/11/2/162, Algorithm for Neutrosophic Soft Sets in Stochastic Multi-Criteria Group Decision Making Based on Prospect Theory https://www.mdpi. com/2073-8994/11/9/1085, On a Reduced Cost Higher Order Traub-Steffensen-Like Method for Nonlinear Systems https://www.mdpi.com/2073-8994/11/7/891, On a Class of Optimal Fourth Order Multiple Root Solvers without Using Derivatives https://www.mdpi.com/2073-8994/11/ 12/1452), to specific uses (Facility Location Problem Approach for Distributed Drones https:// www.mdpi.com/2073-8994/11/1/118, Parametric Jensen-Shannon Statistical Complexity and Its Applications on Full-Scale Compartment Fire Data https://www.mdpi.com/2073-8994/12/1/22) and to probability and statistics (The Asymmetric Alpha-Power Skew-t Distribution https://www. mdpi.com/2073-8994/12/1/82, A Test Detecting the Outliers for Continuous Distributions Based on the Cumulative Distribution Function of the Data Being Tested https://www.mdpi.com/2073-8994/ 11/6/835).

> **Lorentz J ¨antschi, Sorana D. Bolboac˘a** *Editors*
