Conversion to prove whether one integer literal of type :real is <=
The call REAL_INT_LE_CONV `c1 <= c2` where c1 and c2 are integer
literals of type :real, returns whichever of |- c1 <= c2 <=> T or
|- c1 <= c2 <=> F is true. By an integer literal we mean either &n or
-- &n where n is a numeral.
Fails if applied to a term that is not the appropriate inequality comparison on
two permitted integer literals of type :real.
# REAL_INT_LE_CONV `&11 <= &77`;;
val it : thm = |- &11 <= &77 <=> T
The related function REAL_RAT_LE_CONV subsumes this functionality, also
applying to rational literals. Unless the restriction to integers is desired or
a tiny efficiency difference matters, it should be used in preference.