# Spherical polar coordinates/Related Articles

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*See also changes related to Spherical polar coordinates, or pages that link to Spherical polar coordinates or to this page or whose text contains "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]: A series of harmonic basis functions that can be used to describe the boundary of objects with spherical topology.
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