From a39bb3b8aab1aeb4fceaedc54c756703819776c3 Mon Sep 17 00:00:00 2001
From: Prefetch
Date: Sat, 17 Dec 2022 18:19:26 +0100
Subject: Rewrite "Lagrange multiplier", various improvements

---
 source/know/concept/material-derivative/index.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'source/know/concept/material-derivative')

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.
-- 
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