partial differential equations 291 mathematics 44 mathematical analysis 33 differential equations 30 numerical analysis 30 finite elements method 21 parabolic equations 16 more ... calculus of variations 16 elliptic equations 15 functional analysis 13 global analysis 13 numerical solution of equations 12 global differential geometry 11 applied mathematics 10 mathematical physics 10 operator theory 10 differential geometry 9 ordinary differential equations 9 dynamic systems 9 hydromechanics 9 integral equations 9 mathematical models 9 image processing 9 algebraic geometry 8 physics 8 systems theory 8 complex variable function 7 harmonic analysis 7 boundary value problems 7 manifolds 7 less ...