# Spherical polar coordinates/Related Articles  Main Article Discussion Related Articles  [?] Bibliography  [?] External Links  [?] Citable Version  [?] A list of Citizendium articles, and planned articles, about Spherical polar coordinates.

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• Altitude [r]: Distance above a planetary reference point, such as the mean sea level. [e]
• Angular momentum (classical) [r]: The tendency of a rotating object to resist changes to its rotational motion. [e]
• Angular momentum (quantum) [r]: A vector operator of which the three components have well-defined commutation relations. [e]
• Curl [r]: A vector operator that describes the rotation of a vector field. [e]
• Diagonal matrix [r]: A square matrix which has zero entries off the main diagonal. [e]
• Dirac delta function [r]: Sharply peaked function, generalization of the Kronecker delta; a distribution that maps a regular function onto a single function value. [e]
• Divergence [r]: A first order differential vector operator acting on a vector field resulting in a scalar function. [e]
• Electron orbital [r]: Quantum mechanical quadratically integrable one-electron function (function of the coordinates of one electron) [e]
• Euler angles [r]: three rotation angles that describe any rotation of a 3-dimensional object. [e]
• Gauss' law (electrostatics) [r]: Relates the surface integral of the electric displacement through a closed surface to the electric charge enveloped by the closed surface. [e]
• Green's function [r]: Auxiliary function in the theory of linear differential equations; integral operator with Green function as kernel is the inverse of a linear differential operator. [e]
• Hydrogen-like atom [r]: An atom, excluding hydrogen itself, with only one electron, having charge +(Z-1), where Z = atomic number. [e]
• Identity matrix [r]: A square matrix with ones on the main diagonal and zeroes elsewhere: the identity element for matrix multiplication. [e]
• Intermolecular forces [r]: Non-covalent forces between atoms and molecules; often synonymous with Van der Waals forces. [e]
• Jacobian [r]: Determinant of the matrix whose ith row lists all the first-order partial derivatives of the function ƒi(x1, x2, …, xn). [e]
• Latitude [r]: Location north or south of the equator, measured in degrees from the equator, which is 0. [e]
• Legendre polynomials [r]: Orthogonal polynomials in the variable −1 ≤ x ≤ 1 and weight function w(x) = 1. [e]
• Mathematica [r]: Commercial computer algebra system with own programming language that supports functional and procedural programming styles. [e]
• Melbourne [r]: Capital city of the state of Victoria, Australia. [e]
• Multipole expansion of electric field [r]: an expansion in terms of powers of 1/R of an electric potential outside a charge distribution; R is the distance of a point outside to a point inside the charge distribution. [e]
• Polar coordinates [r]: Two numbers—a distance and an angle—that specify the position of a point on a plane. [e]
• Rigid rotor [r]: A 3-dimensional rigid object rotating around its center of mass. [e]
• Slater orbital [r]: Functions used as atomic orbitals in the linear combination of atomic orbitals molecular orbital method. [e]
• Solid harmonics [r]: Solutions of the Laplace equation in spherical polar coordinates. [e]
• Spherical harmonics [r]: Add brief definition or description