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Penrose graphical notation
In
mathematics
and
physics
,
Penrose graphical notation
or
tensor diagram notation
is a (usually handwritten) visual depiction of
multilinear functions
or
tensors
proposed by
Roger Penrose
. A diagram in the notation consists of several shapes linked together by lines. The notation has been studied extensively by
Predrag Cvitanovic
, who used it to classify the
classical Lie groups
. It has also been generalized using
representation theory
to
spin networks
in physics, and with the presence of
matrix groups
to
trace diagrams
in
linear algebra
.
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