open index
English
Noun
open
index
(
plural
open indices
)
(
physics
)
index
(on a tensor) that isn't
summed
over
In the expression
x
μ
=
η
μ
ν
x
ν
{\displaystyle x_{\mu }=\eta _{\mu \nu }x^{\nu }}
, mu is an open index.
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