to a level curve. Four-vector, in the theory of relativity, a vector in a four-dimensional real vector space called Minkowski space See also Vector (mathematics and physics), for a list of various kinds of vectors Cartesian coordinate system Graded vector space Metric space P-vector Riesz–Fischer theorem Space (mathematics) Ordered vector space Notes Citations References Algebra Analysis Historical references . , reprint: Peano, G. (1901) Formulario mathematico: vct axioms via Internet Archive Further references External links Concepts in physics Group theory Mathematical structures Vectors (mathematics and physics)