indefinite subspace

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• Indefinite inner product space — In mathematics, in the field of functional analysis, an indefinite inner product space :(K, langle cdot,,cdot angle, J) is an infinite dimensional complex vector space K equipped with both an indefinite inner product :langle cdot,,cdot angle and… …   Wikipedia

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• Spin representation — In mathematics, the spin representations are particular projective representations of the orthogonal or special orthogonal groups in arbitrary dimension and signature (i.e., including indefinite orthogonal groups). More precisely, they are… …   Wikipedia

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• Linear map — In mathematics, a linear map, linear mapping, linear transformation, or linear operator (in some contexts also called linear function) is a function between two vector spaces that preserves the operations of vector addition and scalar… …   Wikipedia

• Gupta-Bleuler formalism — In quantum field theory, the Gupta Bleuler formalism is a way of quantizing the electromagnetic field. The formulation is due to theoretical physicist Suraj N. Gupta and Konrad Bleuler.Let s start with a single photon first. A basis of the one… …   Wikipedia

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