From 3a3ed2dc8c1307a86e3105c393c0483f82c17119 Mon Sep 17 00:00:00 2001
From: "S.X" <112043984+xiyivan@users.noreply.github.com>
Date: Wed, 13 May 2026 21:53:37 +0100
Subject: [PATCH] Fix dy calculation in Step 9 notebook

---
 lessons/12_Step_9.ipynb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lessons/12_Step_9.ipynb b/lessons/12_Step_9.ipynb
index 8855c39b..e95d7f86 100644
--- a/lessons/12_Step_9.ipynb
+++ b/lessons/12_Step_9.ipynb
@@ -222,7 +222,7 @@
     "ny = 31\n",
     "c = 1\n",
     "dx = 2 / (nx - 1)\n",
-    "dy = 2 / (ny - 1)\n",
+    "dy = 1 / (ny - 1)\n",
     "\n",
     "\n",
     "##initial conditions\n",