[rand.eng.philox] Use normal font for superscript of "ith"

jwakely · tkoeppe · commit b3fa362066ea · 2025-06-16T13:46:21.000+01:00
diff --git a/source/numerics.tex b/source/numerics.tex
@@ -3177,7 +3177,7 @@
 
 \pnum
 The generation algorithm returns $Y_i$,
-the value stored in the $i^{th}$ element of $Y$ after applying
+the value stored in the $i^\text{th}$ element of $Y$ after applying
 the transition algorithm.
 
 \pnum
