# Cartesian coordinates/Related Articles

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A list of Citizendium articles, and planned articles, about Cartesian coordinates.

## Bot-suggested topics

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• Affine space [r]: Collection of points, none of which is special; an n-dimensional vector belongs to any pair of points. [e]
• Curl [r]: A vector operator that describes the rotation of a vector field. [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]
• Euler angles [r]: three rotation angles that describe any rotation of a 3-dimensional object. [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]
• Line (geometry) [r]: (or straight line) In elementary geometry, a maximal infinite curve providing the shortest connection between any two of its points. [e]
• Linear algebra [r]: Branch of mathematics that deals with the theory of systems of linear equations, matrices, vector spaces, determinants, and linear transformations. [e]
• Momentum [r]: mass of a particle times its velocity (a vector). [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]
• Plane (geometry) [r]: In elementary geometry, a flat surface that entirely contains all straight lines passing through two of its points. [e]
• Point (geometry) [r]: An object that has a position but no length, breadth or depth. [e]
• Polar coordinates [r]: Two numbers—a distance and an angle—that specify the position of a point on a plane. [e]
• Polarizability [r]: The ease by which a charge-distribution polarizes; describes the amount of charge separation caused by an electric field. [e]
• Relative permittivity [r]: A factor describing the polarizability of a material or medium as a proportionality between an electric displacement and an electric field in a dielectric. [e]
• René Descartes [r]: French 17th-century philosopher, mathematician and scientist, author of the Discourse on Method. [e]
• Right-hand rule [r]: Rule for the direction of the vector describing a cross product, a torque, or an angular momentum. [e]
• Rotation matrix [r]: a 3×3 proper (unit determinant) orthogonal (orthonormal rows and columns) matrix [e]
• Sine [r]: In a right triangle, the ratio of the length of the side opposite an acute angle (less than 90 degrees) and the length of the hypotenuse. [e]
• Spherical harmonics [r]: A series of harmonic basis functions that can be used to describe the boundary of objects with spherical topology. [e]
• Spherical polar coordinates [r]: Angular coordinates on a sphere: longitude angle φ, colatitude angle θ [e]