finished integrals for real numbers

chapters/sections/integrals.tex

@@ -609,7 +609,7 @@ All functions from now on will be considered measurable.
     We use $\int_A g \dd\mu$ even if $g$ isn't defined outside of $A$.
     Integrals are independent from the behavior on null sets, so 
     \[
-        \int_0^1 \rec{x} \dd x = 0
+        \int_{-1}^1 \rec{x} \dd x = 0
     \]
     is perfectly fine, even though the integrand is not defined for $x = 0$.
 \end{rem}