EntityQ859808· pop 10· linked from 26 articlesbiharmonic functionSign in to savefunction f satisfying Δ²f=0Connectionsharmonic functionEntitymathematicsEntityInternational Standard Book NumberEntityCartesian coordinate systemEntitypolar coordinate systemEntityelasticityEntitycontinuum mechanicsEntitypartial differential equationEntityLaplace operatorEntitynabla operatorEntityanalytic functionEntityMathWorldEntityEric W. WeissteinEntityseparation of variablesEntityfourth powerEntityStokes flowEntityCategoriesElliptic partial differential equations