Use TEX instead of tex!!!
% Preview source code from paragraph 0 to 12x a<x<a+
there is integrabile function f in {[}a,b{]} so f(a)<0.
f is continues from the right of a.
prove that there is so
prove:
there is from the given continuety
in a there is a delta
so for every x in which .
so and the ({*})
f is integrabile in [a,b] and so in [a,a+ ]
from ({*}) and from the monotonicity we conclude
.
i got stuck on the first step:
why they chose such delta and x??
from the defintion it should be there is delta>0 for which in every