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authorPrefetch2022-12-17 18:19:26 +0100
committerPrefetch2022-12-17 18:20:50 +0100
commita39bb3b8aab1aeb4fceaedc54c756703819776c3 (patch)
treeb21ecb4677745fb8c275e54f2ad9d4c2e775a3d8 /source/know/concept/material-derivative
parent49cc36648b489f7d1c75e1fde79f0990e08dd514 (diff)
Rewrite "Lagrange multiplier", various improvements
Diffstat (limited to 'source/know/concept/material-derivative')
-rw-r--r--source/know/concept/material-derivative/index.md4
1 files changed, 2 insertions, 2 deletions
diff --git a/source/know/concept/material-derivative/index.md b/source/know/concept/material-derivative/index.md
index 93e8ad0..7225053 100644
--- a/source/know/concept/material-derivative/index.md
+++ b/source/know/concept/material-derivative/index.md
@@ -16,9 +16,9 @@ e.g. the temperature or pressure,
represented by a scalar field $$f(\va{r}, t)$$.
If the fluid is static, the evolution of $$f$$ is simply $$\ipdv{f}{t}$$,
-since each point of the fluid is motionless.
+since each point is motionless.
However, if the fluid is moving, we have a problem:
-the fluid molecules at position $$\va{r} = \va{r}_0$$ are not necessarily
+the fluid molecules at position $$\va{r} = \va{r}_0$$ are not
the same ones at time $$t = t_0$$ and $$t = t_1$$.
Those molecules take $$f$$ with them as they move,
so we need to account for this transport somehow.