Fix rhs typo in introduction of step-40

diff --git a/examples/step-40/doc/intro.dox b/examples/step-40/doc/intro.dox
index 41db6d845a9da3ebf319b43ff979a5c86f12f18a..1cec5492f6b24d0370e47e852c12a1f6cc4548d8 100644 (file)
--- a/examples/step-40/doc/intro.dox
+++ b/examples/step-40/doc/intro.dox
@@ -114,7 +114,7 @@ discontinuous function,
   =
   \left\{
   \begin{array}{ll}
-    1 & \text{if}\ y < \frac 12 + \frac 14 \sin(4\pi x), \\
+    1 & \text{if}\ y > \frac 12 + \frac 14 \sin(4\pi x), \\
     -1 & \text{otherwise},
   \end{array}
   \right.