58j5358j5058j5165n2535p1511f7253c2034l1534e0557r18 analysisonmanifolds analytic asymptoticexpansions asymptotictheory boundaryvalueproblems congresses differential differentialgeometry differentialtopology discontinuousgroupsandautomorphicforms eigenvalueproblems eigenvalues estimationofeigenvalues geometry globalanalysis globaldifferentialgeometry includingpinching isospectrality manifoldsandcellcomplexes mathematics numbertheory numericalanalysis ordinarydifferentialequations ordinarydifferentialoperators partialdifferentialequations partialdifferentialequationsonmanifolds;differentialoperators relationsbetweenspectraltheoryandergodictheory spectralgeometry spectralproblems;spectralgeometry;scatteringtheory spectraltheory;selbergtraceformula spectraltheoryandeigenvalueproblems symplecticgeometry topologyandgeometryoforbifolds upperandlowerbounds