Hi Brian,
@tex
$$
F_L'(\eta,x) = fcp[k_L] * \exp(exp_F)
$$
@end tex
Thanks for the report. I just installed the following change.
Let me know if still problems. (Gee, who needs primes, anyway? :)
k
--- texinfo.tex.~1.306.~ 2010-02-12 16:57:29.000000000 -0800
+++ texinfo.tex 2010-02-13 09:13:16.000000000 -0800
@@ -5950,2 +5949,6 @@ end
%
+ % ' is active in math mode (mathcode"8000). So reset it, and all our
+ % other math active characters (just in case), to plain's definitions.
+ \mathactive
+ %
\let\b=\ptexb
