Announcements

We are delighted to announce that Symmetry 2023—The 4th International Conference on Symmetry will be held again in person, from 21 to 23 June 2023 in Barcelona, Spain. The event is supported by MDPI’s open access journal Symmetry (ISSN: 2073-8994).

At the Symmetry 2023 conference in Barcelona, we want to address the interplay between symmetry and its breakdown, in the many different domains and situations where they appear. Specifically, we want to foster interaction between scholars working in different fields of science.

We are very enthusiastic about this conference and are relying on you to make it a successful event.

Prof. Dr. Emilio Elizalde
Prof. Dr. Juan Luis García Guirao
Prof. Dr. Sergei D. Odintsov
Symmetry 2023 conference chairs

1. “Two-Stage Hybrid Data Classifiers Based on SVM and kNN Algorithms”
by Liliya A. Demidova
Symmetry 2021, 13(4), 615; https://doi.org/10.3390/sym13040615
Available online: https://www.mdpi.com/2073-8994/13/4/615

2. “Chaos in the Real World: Recent Applications to Communications, Computing, Distributed Sensing, Robotic Motion, Bio-Impedance Modelling and Encryption Systems”
by Giuseppe Grassi
Symmetry 2021, 13(11), 2151; https://doi.org/10.3390/sym13112151
Available online: https://www.mdpi.com/2073-8994/13/11/2151

3. “Quadratic Stabilization of Linear Uncertain Positive Discrete-Time Systems”
by Dušan Krokavec and Anna Filasová
Symmetry 2021, 13(9), 1725; https://doi.org/10.3390/sym13091725
Available online: https://www.mdpi.com/2073-8994/13/9/1725

4. “On the Semi-Analytical Solutions in Hydrodynamics of Ideal Fluid Flows Governed by Large-Scale Coherent Structures of Spiral-Type”
by Sergey V. Ershkov, Alla Rachinskaya, Evgenii Yu. Prosviryakov and Roman V. Shamin
Symmetry 2021, 13(12), 2307; https://doi.org/10.3390/sym13122307
Available online: https://www.mdpi.com/2073-8994/13/12/2307

1. “The Association among Autistic Traits, Interactional Synchrony and Typical Pattern of Motor Planning and Execution in Neurotypical Individuals”
by Michal Granner-Shuman et al.
Symmetry 2021, 13(6), 1034; https://doi.org/10.3390/sym13061034
Available online: https://www.mdpi.com/2073-8994/13/6/1034 

2. “The Fluctuating Asymmetry of the Butterfly Wing Pattern Does Not Change along an Industrial Pollution Gradient”
by Vitali Zverev et al.
Symmetry 2021, 13(4), 626; https://doi.org/10.3390/sym13040626
Available online: https://www.mdpi.com/2073-8994/13/4/626 

3. “Asymmetry of Plant Cell Divisions under Salt Stress”
by Ekaterina N. Baranova et al.
Symmetry 2021, 13(10), 1811; https://doi.org/10.3390/sym13101811
Available online: https://www.mdpi.com/2073-8994/13/10/1811

4. “Neurofunctional Symmetries and Asymmetries during Voluntary out-of- and within-Body Vivid Imagery Concurrent with Orienting Attention and Visuospatial Detection”
by Amedeo D’Angiulli et al.
Symmetry 2021, 13(8), 1549; https://doi.org/10.3390/sym13081549
Available online: https://www.mdpi.com/2073-8994/13/8/1549

1. “Differential Subordination and Superordination Results Using Fractional Integral of Confluent Hypergeometric Function”
by Alina Alb Lupaş and Georgia Irina Oros
Symmetry 2021, 13(2), 327; https://doi.org/10.3390/sym13020327
Available online: https://www.mdpi.com/2073-8994/13/2/327

2. “New Conditions for Univalence of Confluent Hypergeometric Function”
by Georgia Irina Oros
Symmetry 2021, 13(1), 82; https://doi.org/10.3390/sym13010082
Available online: https://www.mdpi.com/2073-8994/13/1/82

3. “Cyclic Control Optimization Algorithm for Stirling Engines”
by Raphael Paul and Karl Heinz Hoffmann
Symmetry 2021, 13(5), 873; https://doi.org/10.3390/sym13050873
Available online: https://www.mdpi.com/2073-8994/13/5/873

4. “An Application of the Principle of Differential Subordination to Analytic Functions Involving Atangana–Baleanu Fractional Integral of Bessel Functions”
by Alina Alb Lupaş and Adriana Cătaş
Symmetry 2021, 13(6), 971; https://doi.org/10.3390/sym13060971
Available online: https://www.mdpi.com/2073-8994/13/6/971

5. “On Special Differential Subordinations Using Fractional Integral of Sălăgean and Ruscheweyh Operators”
by Alina Alb Lupaş and Georgia Irina Oros
Symmetry 2021, 13(9), 1553; https://doi.org/10.3390/sym13091553
Available online: https://www.mdpi.com/2073-8994/13/9/1553

6. “Applications of Banach Limit in Ulam Stability”
by Roman Badora, Janusz Brzdęk and Krzysztof Ciepliński
Symmetry 2021, 13(5), 841; https://doi.org/10.3390/sym13050841
Available online: https://www.mdpi.com/2073-8994/13/5/841

7. “Copulaesque Versions of the Skew-Normal and Skew-Student Distributions”
by Christopher Adcock
Symmetry 2021, 13(5), 815; https://doi.org/10.3390/sym13050815
Available online: https://www.mdpi.com/2073-8994/13/5/815

8. “Hermite Functions and Fourier Series”
by Enrico Celeghini, Manuel Gadella and Mariano A. del Olmo
Symmetry 2021, 13(5), 853; https://doi.org/10.3390/sym13050853
Available online: https://www.mdpi.com/2073-8994/13/5/853

9. “Symmetric Ground States for Doubly Nonlocal Equations with Mass Constraint”
by Silvia Cingolani, Marco Gallo and Kazunaga Tanaka
Symmetry 2021, 13(7), 1199; https://doi.org/10.3390/sym13071199
Available online: https://www.mdpi.com/2073-8994/13/7/1199

10. “Adjoint Operations in Twist-Products of Lattices”
by Ivan Chajda and Helmut Länger
Symmetry 2021, 13(2), 253; https://doi.org/10.3390/sym13020253
Available online: https://www.mdpi.com/2073-8994/13/2/253

11. “On the Relationship between Generalization and Robustness to Adversarial Examples”
by Anibal Pedraza, Oscar Deniz and Gloria Bueno
Symmetry 2021, 13(5), 817; https://doi.org/10.3390/sym13050817
Available online: https://www.mdpi.com/2073-8994/13/5/817

12. “Null Homology Groups and Stable Currents in Warped Product Submanifolds of Euclidean Spaces”
by Yanlin Li, Pişcoran Laurian-Ioan, Akram Ali and Ali H. Alkhaldi
Symmetry 2021, 13(9), 1587; https://doi.org/10.3390/sym13091587
Available online: https://www.mdpi.com/2073-8994/13/9/1587

1. “Atomic Cascade Computations”
by Stephan Fritzsche et al.
Symmetry 2021, 13(3), 520; https://doi.org/10.3390/sym13030520
Available online: https://www.mdpi.com/2073-8994/13/3/520

2. “Nanofluids Characterization for Spray Cooling Applications”
by Ana P. C. Ribeiro; Ana S. Moita; Guido Marseglia et al.
Symmetry 2021, 13(5), 788; https://doi.org/10.3390/sym13050788
Available online: https://www.mdpi.com/2073-8994/13/5/788

3. “Phosphorus Compounds of Natural Origin: Prebiotic, Stereochemistry, Application”
by Oleg I. Kolodiazhnyi
Symmetry 2021, 13(5), 889; https://doi.org/10.3390/sym13050889
Available online: https://www.mdpi.com/2073-8994/13/5/889

4. “Extreme Poisson’s Ratios of Honeycomb, Re-Entrant, and Zig-Zag Crystals of Binary Hard Discs”
by Krzysztof W. Wojciechowski et al.
Symmetry 2021, 13(6), 127; https://doi.org/10.3390/sym13071127
Available online: https://www.mdpi.com/2073-8994/13/7/1127

5. “An Auxetic System Based on Interconnected Y-Elements Inspired by Islamic Geometric Patterns”
by Teik-Cheng Lim
Symmetry 2021, 13(5), 865; https://doi.org/10.3390/sym13050865
Available online: https://www.mdpi.com/2073-8994/13/5/865

6. “Scalable Codes for Precision Calculations of Properties of Complex Atomic Systems”
by Charles Cheung et al.
Symmetry 2021, 13(4), 621; https://doi.org/10.3390/sym13040621
Available online: https://www.mdpi.com/2073-8994/13/4/621

7. “Elastic Origin of the Unsymmetrical Thermal Hysteresis in Spin Crossover Materials: Evidence of Symmetry Breaking”
by Kamel Boukheddaden et al.
Symmetry 2021, 13(5), 828; https://doi.org/10.3390/sym13050828
Available online: https://www.mdpi.com/2073-8994/13/5/828

8. “2-Pyridylselenenyl versus 2-Pyridyltellurenyl Halides: Symmetrical Chalcogen Bonding in the Solid State and Reactivity towards Nitriles”
by Alexander G. Tskhovrebov et al.
Symmetry 2021, 13(12), 350; https://doi.org/10.3390/sym13122350
Available online: https://www.mdpi.com/2073-8994/13/12/2350

1. “Thermodynamics of Barrow Holographic Dark Energy with Specific Cut-Off”
by Gargee Chakrabortyet al.
Symmetry 2021, 13(4), 562; https://doi.org/10.3390/sym13040562
Available online: https://www.mdpi.com/2073-8994/13/4/562 

2. “Higgs and BSM Physics at the Future Muon Collider”
by Roberto Franceschini et al.
Symmetry 2021, 13(5), 851; https://doi.org/10.3390/sym13050851
Available online: https://www.mdpi.com/2073-8994/13/5/851

3. “Gravitational Decoupling in Higher Order Theories”
by Joseph Sultana
Symmetry 2021, 13(9), 1598; https://doi.org/10.3390/sym13091598
Available online: https://www.mdpi.com/2073-8994/13/9/1598

4. “The Qualitative and Quantitative Study of Radiation Sources with a Model Configuration of the Electrode System”
by Victor V. Kuzenov et al.
Symmetry 2021, 13(6), 927; https://doi.org/10.3390/sym13060927
Available online: https://www.mdpi.com/2073-8994/13/6/927

5. “New Conservation Laws and Exact Cosmological Solutions in Brans–Dicke Cosmology with an Extra Scalar Field”
by Antonios Mitsopoulos et al.
Symmetry 2021, 13(8), 1364; https://doi.org/10.3390/sym13081364
Available online: https://www.mdpi.com/2073-8994/13/8/1364

6. “IDM Benchmarks for the LHC and Future Colliders”
by Jan Kalinowski et al.
Symmetry 2021, 13(6), 991; https://doi.org/10.3390/sym13060991
Available online: https://www.mdpi.com/2073-8994/13/6/991

7. “New Light H± Discovery Channels at the LHC”
by Abdesslam Arhrib et al.
Symmetry 2021, 13(12), 2319; https://doi.org/10.3390/sym13122319     
Available online: https://www.mdpi.com/2073-8994/13/12/2319

8. “Energetic Particle Superdiffusion in Solar System Plasmas: Which Fractional Transport Equation?”
by Gaetano Zimbardo et al.
Symmetry 2021, 13(12), 2368; https://doi.org/10.3390/sym13122368
Available online: https://www.mdpi.com/2073-8994/13/12/2368

This month marks the 10th anniversary of the discovery of the Higgs Boson particle. We are pleased to announce that we have selected six papers about the Higgs Boson published in Symmetry (ISSN: 2073-8994) in 2020 and 2021. You are welcome to read them!

1. “IDM Benchmarks for the LHC and Future Colliders”
by Jan Kalinowski et al.
Symmetry 2021, 13(6), 991; https://doi.org/10.3390/sym13060991
Available online: https://www.mdpi.com/2073-8994/13/6/991

2. “Higgs and BSM Physics at the Future Muon Collider”
by Roberto Franceschini et al.
Symmetry 2021, 13(5), 851; https://doi.org/10.3390/sym13050851
Available online: https://www.mdpi.com/2073-8994/13/5/851

3. “Quintessential Inflation with Dynamical Higgs Generation as an Affine Gravity”
by David Benisty et al.
Symmetry 2020, 12(5), 734; https://doi.org/10.3390/sym12050734
Available online: https://www.mdpi.com/2073-8994/12/5/734

4. “Collider Searches for Dark Matter through the Higgs Lens”
by Spyros Argyropoulos et al.
Symmetry 2021, 13(12), 2406; https://doi.org/10.3390/sym13122406
Available online: https://www.mdpi.com/2073-8994/13/12/2406

5. “Mass, Spacetime Symmetry, de Sitter Vacuum, and the Higgs Mechanism”
by Irina Dymnikova
Symmetry 2020, 12(4), 634; https://doi.org/10.3390/sym12040634
Available online: https://www.mdpi.com/2073-8994/12/4/634

6. “Cosmic-Ray Studies with Experimental Apparatus at LHC”
by Emma González Hernández et al.
Symmetry 2020, 12(10), 1694; https://doi.org/10.3390/sym12101694
Available online: https://www.mdpi.com/2073-8994/12/10/1694

We are pleased to announce that we have selected the ten top downloaded articles published in Symmetry (ISSN: 2073-8994) in 2021. You are welcome to read them!

1. “Differential Subordination and Superordination Results Using Fractional Integral of Confluent Hypergeometric Function”
by Alina Alb Lupaş et al.
Symmetry 2021, 13(2), 327; https://doi.org/10.3390/sym13020327
Available online: https://www.mdpi.com/2073-8994/13/2/327

2. “Fluctuation–Dissipation Relations in Active Matter Systems”
by Lorenzo Caprini et al.
Symmetry 2021, 13(1), 81; https://doi.org/10.3390/sym13010081
Available online: https://www.mdpi.com/2073-8994/13/1/81

3. “Atomic Cascade Computations”
by Stephan Fritzsche et al.
Symmetry 2021, 13(3), 520; https://doi.org/10.3390/sym13030520
Available online: https://www.mdpi.com/2073-8994/13/3/520

4. “Global Sensitivity Analysis of Quantiles: New Importance Measure Based on Superquantiles and Subquantiles”
by Zdeněk Kala.
Symmetry 2021, 13(2), 263; https://doi.org/10.3390/sym13020263
Available online: https://www.mdpi.com/2073-8994/13/2/263

5. “Nanofluids Characterization for Spray Cooling Applications”
by Miguel Sanches et al.
Symmetry 2021, 13(5), 788; https://doi.org/10.3390/sym13050788
Available online: https://www.mdpi.com/2073-8994/13/5/788

6. “Extreme Poisson’s Ratios of Honeycomb, Re-Entrant, and Zig-Zag Crystals of Binary Hard Discs”
by Mikołaj Bilski et al.
Symmetry 2021, 13(7), 1127; https://doi.org/10.3390/sym13071127
Available online: https://www.mdpi.com/2073-8994/13/7/1127

7. “Mass and Rate of Hierarchical Black Hole Mergers in Young, Globular and Nuclear Star Clusters”
by Michela Mapelli et al.
Symmetry 2021, 13(9), 1678; https://doi.org/10.3390/sym13091678
Available online: https://www.mdpi.com/2073-8994/13/9/1678

8. “A New Quantile Regression for Modeling Bounded Data under a Unit Birnbaum–Saunders Distribution with Applications in Medicine and Politics”
by Josmar Mazucheli et al.
Symmetry 2021, 13(4), 682; https://doi.org/10.3390/sym13040682
Available online: https://www.mdpi.com/2073-8994/13/4/682

9. “The Symmetric Nature of the Position Distribution of the Human Body Center of Gravity during Propelling Manual Wheelchairs with Innovative Propulsion Systems”
by Bartosz Wieczorek et al.
Symmetry 2021, 13(1), 154; https://doi.org/10.3390/sym13010154
Available online: https://www.mdpi.com/2073-8994/13/1/154

10. “Cyclic Control Optimization Algorithm for Stirling Engines”
by Raphael Paul et al.
Symmetry 2021, 13(5), 873; https://doi.org/10.3390/sym13050873
Available online: https://www.mdpi.com/2073-8994/13/5/873

We are pleased to announce that we have selected the ten top downloaded articles published in Symmetry (ISSN: 2073-8994) in 2020. You are welcome to read them!

1. “On the Remarkable Superconductivity of FeSe and Its Close Cousins”
by Andreas Kreisel et al.
Symmetry 2020, 12(9), 1402; https://doi.org/10.3390/sym12091402
Available online: https://www.mdpi.com/2073-8994/12/9/1402

2. “On the Dynamics of a Visco–Piezo–Flexoelectric Nanobeam”
by Mohammad Malikan et al.
Symmetry 2020, 12(4), 643; https://doi.org/10.3390/sym12040643
Available online: https://www.mdpi.com/2073-8994/12/4/643

3. “Tetra- and Penta-Quark Structures in the Constituent Quark Model”
by Gang Yang et al.
Symmetry 2020, 12(11), 1869; https://doi.org/10.3390/sym12111869
Available online: https://www.mdpi.com/2073-8994/12/11/1869

4. “Two-Pole Structures in QCD: Facts, Not Fantasy!”
by Ulf-G. Meißner.
Symmetry 2020, 12(6), 981; https://doi.org/10.3390/sym12060981
Available online: https://www.mdpi.com/2073-8994/12/6/981

5. “Thermogravitational Convection of Hybrid Nanofluid in a Porous Chamber with a Central Heat-Conducting Body”
by Mikhail A. Sheremet et al.
Symmetry 2020, 12(4), 593; https://doi.org/10.3390/sym12040593
Available online: https://www.mdpi.com/2073-8994/12/4/593

6. “Mechanical Chirality of Rotaxanes: Synthesis and Function”
by Kazuko Nakazono et al.
Symmetry 2020, 12(1), 144; https://doi.org/10.3390/sym12010144
Available online: https://www.mdpi.com/2073-8994/12/1/144

7. “Bilaterally Symmetrical: To Be or Not to Be?”
by Michael C. Corballis
Symmetry 2020, 12(3), 326; https://doi.org/10.3390/sym12030326
Available online: https://www.mdpi.com/2073-8994/12/3/326

8. “Strength, Jumping and Change of Direction Speed Asymmetries in Soccer, Basketball and Tennis Players”
by Nejc Šarabon et al.
Symmetry 2020, 12(10), 1664; https://doi.org/10.3390/sym12101664
Available online: https://www.mdpi.com/2073-8994/12/10/1664

9. “Are MCDA Methods Benchmarkable? A Comparative Study of TOPSIS, VIKOR, COPRAS, and PROMETHEE II Methods”
by Wojciech Sałabun et al.
Symmetry 2020, 12(9), 1549; https://doi.org/10.3390/sym12091549
Available online: https://www.mdpi.com/2073-8994/12/9/1549

10. “Puu System of Fractional Order and Its Chaos Suppression”
by Marius-F. Danca et al.
Symmetry 2020, 12(3), 340; https://doi.org/10.3390/sym12030340
Available online: https://www.mdpi.com/2073-8994/12/3/340

We are proud to recognize the winners of MDPI’s 2021 Travel Awards in the subject area of “Computer Science & Mathematics” for their outstanding presentations and to present them with the prize.

MDPI journals regularly offer travel awards to encourage talented junior scientists to present their latest research at academic conferences in specific fields, which helps to increase their influence.

The winners mentioned below were carefully selected by the journal editors based on an outline of their research and the work to be presented at an academic conference.

We would like to warmly congratulate the winners of Travel Awards for the year 2021 and wish them the greatest success with their future research endeavors.

MDPI will continue to enhance communication among scientists.

Computers:

• Umberto Michieli, University of Padova, Italy

Journal of Imaging:

• Cameron Kaye, University of Manitoba, Canada
• Alexandra Trujillo, Universidad Nacional del Sur, Argentina

Symmetry:

• José María, Autonomous University of Madrid, Spain
• Naser Ojaroudi Parchin, University of Bradford, UK