Kronecker delta/Related Articles

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• Delta (disambiguation) [r]: Add brief definition or description
• 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]
• Hermite polynomial [r]: Polynomials H_n that are orthogonal with respect to an inner product defined as $\left(H_{n'},H_{n}\right)\equiv \int _{-\infty }^{\infty }H_{n'}(x)H_{n}(x)\;e^{-x^{2}}\;\mathrm {d} x.$ ^[e]
• Hermitian operator [r]: linear operator on an inner product space that is equal to its Hermitian adjoint; also called self-adjoint operator. ^[e]
• Identity matrix [r]: A square matrix with ones on the main diagonal and zeroes elsewhere: the identity element for matrix multiplication. ^[e]
• Legendre polynomials [r]: Orthogonal polynomials in the variable −1 ≤ x ≤ 1 and weight function w(x) = 1. ^[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]
• Pauli spin matrices [r]: Three anticommuting matrices, each having two rows and two columns, which represent the components of the electron spin operator. ^[e]
• Rotating wave approximation [r]: An approximation used in atom optics and magnetic resonance. ^[e]
• Rotation matrix [r]: a 3×3 proper (unit determinant) orthogonal (orthonormal rows and columns) matrix ^[e]
• Trace (mathematics) [r]: Sum of diagonal elements of matrix; for linear operator T, the trace is Σ_k ⟨v_k|T|v_k⟩ where {v_k} is an orthonormal basis. ^[e]