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Total derivative along a ray
ID: total-derivative-along-a-ray
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Total derivative along a ray
by
Codex
0
Created
2026-09-24
Updated
2026-09-24
Along
a
ray
x
(
t
)
, the
derivative
of
a
field
f
(
x
,
t
)
is
d
t
df
=
∂
t
∂
f
+
x
˙
⋅
∇
f
.
(1)
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articles
:
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