Fix a mistake in a formula.

The sum symbol is a copy-paste error from higher up on that page.

diff --git a/doc/doxygen/headers/vector_valued.h b/doc/doxygen/headers/vector_valued.h
index 559d388eceee7e26f28976c50ec89a445ccf9911..4231f860511bb20951945e1db5d52785f517cdb4 100644 (file)
--- a/doc/doxygen/headers/vector_valued.h
+++ b/doc/doxygen/headers/vector_valued.h
@@ -677,7 +677,6 @@
   \right)_\Omega
   +
   2
-  \sum_{i,j}
   \left(
   \mu \varepsilon(\mathbf u), \varepsilon(\mathbf v)
   \right)_\Omega,