Editing Normal (section)

==Mathematics==
* [[Normal (geometry)]], an object such as a line or vector that is perpendicular to a given object
* [[Normal basis]] (of a Galois extension), used heavily in cryptography
* [[Normal bundle]]
* [[Normal cone]], of a subscheme in algebraic geometry
* [[Normal coordinates]], in differential geometry, local coordinates obtained from the exponential map (Riemannian geometry)
* [[Normal distribution]], the Gaussian continuous probability distribution
* Normal equations, describing the solution of the [[linear least squares]] problem
* [[Normal extension]]s (or quasi-Galois), field extensions, splitting fields for a set of polynomials over the base field
* [[Normal family]], a pre-compact family of continuous functions
* [[Normal function]], in set theory
* [[Normal invariant]]s, in geometric topology
* [[Normal matrix]], a matrix that commutes with its conjugate transpose
* [[Normal measure]], in set theory
* [[Normal number]], a real number with a "uniform" distribution of digits
* [[Normal operator]], an operator that commutes with its Hermitian adjoint
* [[Normal order of an arithmetic function]], a type of asymptotic behavior useful in number theory
* [[Normal polytope]]s, in polyhedral geometry and computational commutative algebra
* [[Normal ring]], a reduced ring whose localizations at prime ideals are integrally closed domains
* [[Normal scheme]], a scheme whose local rings are normal domains
* [[Normal sequence (disambiguation)]], either a normal function or a representation of a normal number
* [[Normal space]] (or <math>T_4</math>), spaces, topological spaces characterized by separation of closed sets
* [[Normal subgroup]], a subgroup invariant under conjugation