▼	Set of symbols
▼	Alphabet
▼	Deduction system
▼	Theory
▼	Zermelo-Fraenkel set theory
▼	Set
▼	Binary cartesian set product
▼	Binary relation
▼	Map
▼	Operation
▼	N-operation
▼	Binary operation
▼	Enclosed binary operation
▼	Groupoid
▼	Ringoid
▼	Semiring
▼	Ring
▼	Left ring action
▼	Module
▼	Linear combination
▼	Linear map
▼	Multilinear map
▼	Bilinear map
▼	Sesquilinear map
▼	Hermitian map
▼	Hermitian form
▼	Semi-inner product
▼	Inner product

▶	D4115: Gram-Schmidt projection
▶	D37: Orthogonal vector pair

▶	R24: Parallelogram identity

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