Let are ANY non-negative and measurable. is measure
Find two function $f_n,g_n$ such that HAVE ONLY FINITELY MANY VALUE and
for any natural number $n$,
And C is independent of n.
*Important* above integral is (improper) riemann integral !!
(In fact, this problem is from ANALYSIS by Lieb and Loss.. so definition of integral is different from other books
it defines integral by so i wrote the problem as above..)
P.S. sorry for poor english..
-I correct some mistakes -