Symmetry | Selected Papers from the 2021 Editor’s Choice Articles in the Sections “Engineering Science and Symmetry/Asymmetry” and “Computer Science and Symmetry/Asymmetry”

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: http://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: http://www.mdpi.com/2073-8994/13/12/2307