direct sum
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Connections
vector space
Entity
Hilbert space
Entity
abelian group
Entity
linear map
Entity
Banach space
Entity
subgroup
Entity
topological vector space
Entity
coproduct
Entity
category of rings
Entity
mathematics
Entity
International Standard Book Number
Entity
group
Entity
abstract algebra
Entity
Cartesian coordinate system
Entity
commutative property
Entity
associativity
Entity
Cartesian product
Entity
field
Entity
isomorphism
Entity
bijection
Entity