Update opps.tex

Author: Pietro Monticone

content/set-theory/card-arithmetic/opps.tex

@@ -119,7 +119,7 @@
 \noindent
 So $\omega < \cardexpo{2}{\omega}$. But note: this is a result about
 \emph{cardinal} exponentiation. It should be contrasted with
-\emph{ordinal} exponentation, since in the latter case $\omega =
+\emph{ordinal} exponentiation, since in the latter case $\omega =
 \ordexpo{2}{\omega}$ (see \olref[ord-arithmetic][expo]{sec}).
 
 Whilst we are on the topic of cardinal exponentiation, we can also be