Integral equations Mathematics 18 Integral Equations 17 Differential equations 12 Differential equations, Partial 11 Partial Differential Equations 8 Operator theory 7 Numerical solutions 6 Operator Theory 6 Functional analysis 5 Numerical Analysis 5 Numerical analysis 5 Ordinary Differential Equations 5 Functional Analysis 4 Functions of complex variables 4 Mathematical physics 4 Applied mathematics 3 Engineering mathematics 3 Harmonic analysis 3 Algebra 2 Appl.Mathematics/Computational Methods of Engineering 2 Boundary value problems 2 Electromagnetism 2 Exponential functions 2 Fourier series 2 Mathematical analysis 2 Mathematical models 2 Nonlinear theories 2 Probabilities 2 Probability Theory and Stochastic Processes 2