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- Angular momentum (classical) : The tendency of a rotating object to resist changes to its rotational motion.
- Antisymmetrizer : operator that projects onto an antisymmetric subspace of a tensor product space of identical linear spaces;
- Characteristic polynomial : The polynomial attached to a square matrix or endomorphism det(A-XI)=0.
- Diagonal matrix : A square matrix which has zero entries off the main diagonal.
- Dirac delta function : Sharply peaked function, generalization of the Kronecker delta; a distribution that maps a regular function onto a single function value.
- Eigenvalue : 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.
- GF method : Method to compute the normal coordinates of a vibrating molecule.
- Identity (mathematics) : Add brief definition or description
- Identity element : An element whose behaviour with respect to a binary operation generalises that of zero for addition or one for multiplication.
- Identity function : The function from a set to itself which maps each element to itself.
- Kronecker delta : A quantity depending on two subscripts which is equal to one when they are equal and zero when they are unequal.
- Linear quadratic control : Controller design for a deterministic linear plant based on the minimization of a quadratic cost functional.
- Matrix inverse : The equivalent of the reciprocal defined for certain matrices.
- Matrix : A mathematical construct generally represented as a rectangular array of elements.
- Molecular orbital theory : Deals with definition and computation of molecular orbitals.
- Monoid : An algebraic structure with an associative binary operation and an identity element.
- Pauli spin matrices : Three anticommuting matrices, each having two rows and two columns, which represent the components of the electron spin operator.
- Reflection (geometry) : In Euclidean geometry, a distance preserving transformation that reverses orientation
- Rotation matrix : a 3×3 proper (unit determinant) orthogonal (orthonormal rows and columns) matrix
- Spherical harmonics : A series of harmonic basis functions that can be used to describe the boundary of objects with spherical topology.
- Spherical polar coordinates : Angular coordinates on a sphere: longitude angle φ, colatitude angle θ
- Vector field : A vector function on the three-dimensional Euclidean space .
- Zero matrix : A matrix consisting entirely of zero entries.