Functions of complex variables Partial differential equations Electronic resources (E-books) 80 Functional analysis 22 Differential geometry 16 Operator theory 15 Integral transforms 10 more ... Operational calculus 10 Analysis (Mathematics) 9 Mathematical analysis 9 Differential equations 8 Global analysis (Mathematics) 8 Manifolds (Mathematics) 8 Potential theory (Mathematics) 8 Integral equations 7 Mathematical physics 7 Calculus of variations 6 Fourier analysis 6 Functions of real variables 6 Physics 6 Special functions 6 Applied mathematics 5 Approximation theory 5 Engineering mathematics 5 Algebraic geometry 4 Harmonic analysis 4 Lie groups 4 Topological groups 4 Difference equations 3 Functional equations 3 less ...