diff --git a/Bookshelf/Real/Basic.lean b/Bookshelf/Real/Basic.lean
index abec47e..2b2d76d 100644
--- a/Bookshelf/Real/Basic.lean
+++ b/Bookshelf/Real/Basic.lean
@@ -2,8 +2,6 @@ import Mathlib.Data.Real.Basic
 
 notation "ℝ²" => ℝ × ℝ
 
-notation "ℝ³" => ℝ² × ℝ
-
 namespace Real
 
 /--