# Identity matrix/Related Articles

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- Angular momentum (classical) [r]: The tendency of a rotating object to resist changes to its rotational motion.
^{[e]} - Antisymmetrizer [r]: operator that projects onto an antisymmetric subspace of a tensor product space of identical linear spaces;
^{[e]} - Characteristic polynomial [r]: The polynomial attached to a square matrix or endomorphism det(A-XI)=0.
^{[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]} - Eigenvalue [r]: A vector
*v*is an eigenvector of a matrix*A*if**A***v*= λ*v*; the number λ is the eigenvalue of the matrix**A**belonging to the eigenvector*v*.^{[e]} - GF method [r]: Method to compute the normal coordinates of a vibrating molecule.
^{[e]} - Identity (mathematics) [r]:
*Add brief definition or description* - Identity element [r]: An element whose behaviour with respect to a binary operation generalises that of zero for addition or one for multiplication.
^{[e]} - Identity function [r]: The function from a set to itself which maps each element to itself.
^{[e]} - Kronecker delta [r]: A quantity depending on two subscripts which is equal to one when they are equal and zero when they are unequal.
^{[e]} - Linear quadratic control [r]: Controller design for a deterministic linear plant based on the minimization of a quadratic cost functional.
^{[e]} - Matrix inverse [r]: The equivalent of the reciprocal defined for certain matrices.
^{[e]} - Matrix [r]: A mathematical construct generally represented as a rectangular array of elements.
^{[e]} - Molecular orbital theory [r]: Deals with definition and computation of molecular orbitals.
^{[e]} - Monoid [r]: An algebraic structure with an associative binary operation and an identity element.
^{[e]} - Pauli spin matrices [r]: Three anticommuting matrices, each having two rows and two columns, which represent the components of the electron spin operator.
^{[e]} - Reflection (geometry) [r]: In Euclidean geometry, a distance preserving transformation that reverses orientation
^{[e]} - Rotation matrix [r]: a 3×3 proper (unit determinant) orthogonal (orthonormal rows and columns) matrix
^{[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]} - Vector field [r]: A vector function on the three-dimensional Euclidean space .
^{[e]} - Zero matrix [r]: A matrix consisting entirely of zero entries.
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