EntityQ4918412· pop 6· linked from 23 articlesbispherical coordinatesSign in to save3D orthogonal coordinate system that results from rotating the 2D bipolar coordinate system about the axis that connects the two fociConnectionsorthogonal coordinate systemEntitybipolar coordinatesEntityInternational Standard Book NumberEntityelectric fieldEntitycoordinate systemEntityCartesian coordinate systemEntityLibrary of Congress Control NumberEntitypolar coordinate systemEntitynatural logarithmEntityspherical coordinate systemEntitypartial differential equationEntityLaplace's equationEntitycylindrical coordinate systemEntityfocusEntityHelmholtz equationEntityseparation of variablesEntityelliptic coordinate systemEntityparabolic coordinatesEntityparabolic cylindrical coordinatesEntityellipsoidal coordinatesEntityCategoriesOrthogonal coordinate systemsThree-dimensional coordinate systems