Fixup: \defnx{equality preserving}

Author: CaseyCarter

source/concepts.tex

@@ -24,10 +24,10 @@
 \rSec2[concepts.lib.general.equality]{Equality Preservation}
 
 \pnum
-An expression is \term{equality preserving} if, given equal inputs, the
-expression results in equal outputs. The inputs to an expression are the set of
-the expression's operands. The output of an expression is the expression's
-result and all operands modified by the expression.
+An expression is \defnx{equality preserving}{expression!equality preserving} if,
+given equal inputs, the expression results in equal outputs. The inputs to an
+expression are the set of the expression's operands. The output of an expression
+is the expression's result and all operands modified by the expression.
 
 \pnum
 Not all input values must be valid for a given expression; e.g., for integers