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A parametric operator
Ω
{\displaystyle \Omega \!}
with parameter
α
{\displaystyle \alpha \!}
in the parameter set
A
{\displaystyle \mathrm {A} \!}
is an indexed family of operators
(
Ω
α
)
A
=
{
Ω
α
:
α
∈
A
}
{\displaystyle (\Omega _{\alpha })_{\mathrm {A} }=\{\Omega _{\alpha }:\alpha \in \mathrm {A} \}\!}
with index
α
{\displaystyle \alpha \!}
in the index set
A
.
{\displaystyle \mathrm {A} .\!}
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