1917-1989 510 515 acousticsandphysics analysedefourier analysis approximationtheory automorphicfunctions boundaryvalueproblems calculus cartography combinatorialanalysis computerprograms computerscience congresses differentialequations differentialoperators distribution(probabilitytheory) earthsciences engineering evolutionequations fourierseries fouriertransformations fouriertransforminfraredspectroscopy fouriertransformspectroscopy functionalanalysis functions functionsofacomplexvariable functionsofcomplexvariables geodesy geography geophysics gibbsphenomenon globalanalysis(mathematics) globalanalysisandanalysisonmanifolds géodésie géophysique harmonicanalysis infinity infrared infraredfouriertransformspectroscopy infraredspectroscopy integralequations integraltransforms mathematicalanalysis mathematicaloptimization mathematics mathématiques music musictheory nanoelectronics nanophotonics nanophotonique nanoélectronique nilpotentliegroups numericalsolutions operatortheory ordinarydifferentialequations orthogonal orthogonalpolynomials partial partialdifferentialequations philosophyandaesthetics photonics pseudodifferentialoperators qa374 qa404c563f1978 realfunctions science selfadjointoperators semigroupsofoperators sequences sequences(mathematics) series singh special specialfunctions spectrophotometry spectroscopiepartransforméedefourier spectrumanalysis splinetheory stochasticprocesses summability symmetricspaces technology time-seriesanalysis topologicalgroups uditanarayana wavelets(mathematics)