analysefonctionnelle asymptoticexpansions banachalgebras commutativealgebra computationalcomplexity differentialequations elliptic fonctionanalytique fonctionsanalytiques forms functionalanalysis functionsofacomplexvariable functionsofcomplexvariables functionsofrealvariables harmonicanalysis infinite linear mathematics monotonicfunctions numericalsolutions numerischesverfahren operatortheory potenzreihe potenzreihenentwicklung powerseries prolongementanalytique quadratic quasianalyticfunctions quasiconformalmappings series sériepuissance sériesdepuissances