From 5f89fc74297e2528f792263c103900421ca031a5 Mon Sep 17 00:00:00 2001
From: Yingjie Wang <phywyj@gmail.com>
Date: Thu, 9 Apr 2026 20:08:01 -0400
Subject: [PATCH] update: auto commit

---
 report.tex | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/report.tex b/report.tex
index 1bbf207..ddd632b 100644
--- a/report.tex
+++ b/report.tex
@@ -257,7 +257,7 @@
     \begin{equation}
       \pdvt[2]{\phi} - \tensor{\delta}{^i^j} \Partial{i} \Partial{j} \phi = 0,
     \end{equation}
-    we can introduce $\pi := \pdvt{\phi}$ and $\psi := \pdv{\phi}{x}$, and rewrite the wave equation as
+    we can introduce $\pi := \pdvt{\phi}$ and $\tensor{\psi}{_i} := \Partial{_i} \phi$, and rewrite the wave equation as
     \begin{equation}
       \begin{cases}
         \pdvt{\phi} = \pi, \\