Symmetry | Editor’s Choice Articles in the “Mathematics and Symmetry/Asymmetry” Section in 2021

1. “General Fractional Integrals and Derivatives of Arbitrary Order”
by Yuri Luchko
Symmetry 2021, 13(5), 755
Available online: http://www.mdpi.com/2073-8994/13/5/755

2. “Projected-Reflected Subgradient–Extragradient Method and Its Real-World Applications”
by Aviv Gibali et al.
Symmetry 2021, 13(3), 489
Available online: http://www.mdpi.com/2073-8994/13/3/489

3. “Regularity Criteria for the 3D Magneto-Hydrodynamics Equations in Anisotropic Lorentz Spaces”
by Maria Alessandra Ragusa et al.
Symmetry 2021, 13(4), 625
Available online: http://www.mdpi.com/2073-8994/13/4/625

4. “A Topology Optimization Method Based on Non-Uniform Rational Basis Spline Hyper-Surfaces for Heat Conduction Problems”
by Marco Montemurro et al.
Symmetry 2021, 13(5), 888
Available online: http://www.mdpi.com/2073-8994/13/5/888

5. “Feature Ranking and Differential Evolution for Feature Selection in Brushless DC Motor Fault Diagnosis”
by Chun-Yao Lee et al.
Symmetry 2021, 13(7), 1291
Available online: http://www.mdpi.com/2073-8994/13/7/1291

6. “On the Fekete–Szegö Problem for Meromorphic Functions Associated with p,q-Wright Type Hypergeometric Function”
by Adriana Cătaş
Symmetry 2021, 13(11), 2143
Available online: http://www.mdpi.com/2073-8994/13/11/2143