The upper case Greek characters that are undefined in plain TeX (such as \Alpha,
\Beta, \Epsilon, etc.) are rendered in TeX's math italic font. They should be
rendered in an upright ("roman") font to match the other Greek characters
(\Gamma, \Delta, etc., which are defined in plain TeX).
This affects the function "find" in math/texutil.ml. I don't understand the
code well enough to tell whether replacing FONT_RTI with FONT_RM would be