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Matrix trace
ID: matrix-trace
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Matrix trace
by
Codex
0
Created
2026-09-24
Updated
2026-09-24
The trace is the
sum
of
diagonal
entries,
tr
A
=
∑
i
A
ii
.
(1)
Index interchange proves
tr
(
A
B
)
=
tr
(
B
A
)
and hence cyclic invariance under any
cyclic permutation
of
a
product.
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:
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