EntityQ1936897· pop 9· linked from 23 articlesstationary phase approximationSign in to savebasic principle of asymptotic analysis due to George Gabriel Stokes and Lord KelvinConnectionsHessian matrixEntityMorse theoryEntitymathematicsEntityInternational Standard Book NumberEntityDavid HilbertEntityWilliam Thomson, 1st Baron KelvinEntityOCLC, Inc.EntityTaylor seriesEntitySir George Stokes, 1st BaronetEntitysine waveEntitycomplex conjugateEntityFeynman diagramEntityLars HörmanderEntityquadratic formEntityRichard CourantEntityJean DieudonnéEntityFresnel integralEntitycritical pointEntityEncyclopedia of MathematicsEntitysecond derivativeEntityCategoriesMathematical analysisPerturbation theory