integral operatorintegral optimizationintegral partintegral powerintegral quaternionintegral r chainintegral r chain groupintegral representationintegral rootintegral setintegral signintegral sineintegral symbolintegral testintegral test for convergenceintegral transformintegral transformationintegral transformsintegral valueintegral with respect to xintegrallyintegrally closed ringintegrally dependentintegrandintegrantintegraphintegrateintegrated circuitintegratingintegrating factorintegrationintegration byintegration by change of variableintegration by partintegration by partial fractionsintegration by partsintegration by power seriesintegration by substitutionintegration by use of seriesintegration constantintegration factorintegration operatorintegratorintegriintegro differential equationintelligentintenseintensifierintensityintensity of electric field