Mathematical transformations 46 Mathematical models 10 Computational methods 8 MATHEMATICAL TRANSFORMATIONS 8 Eigenvalues and eigenfunctions 6 Quantum theory 6 Statistical mechanics 6 Approximation theory 4 Boundary conditions 4 Current density 4 Differential equations 4 ELECTRIC NETWORKS 4 Electric field effects 4 Electric quadrupole polarizabilities 4 Electrons 4 Extreme Fisher information principle 4 Functions 4 Integral equations 4 Lagrange multipliers 4 Magnetic shielding 4 Matrix algebra 4 Nuclear magnetic shielding 4 Numerical analysis 4 Optical systems 4 Phase modulation 4 Polarization 4 Probability distributions 4 Random processes 4 Surface properties 4 Theorem proving 4