- #1

manuel huant

- 4

- 0

## Homework Statement

if f is integrable, then the set N(f) = {x : f(x)≠ 0} is [itex]\sigma[/itex]-finite

## Homework Equations

i am stucked in this proof , somebody help me please

## The Attempt at a Solution

if f is simple the it seems the set is finite since otherwise the the integral won't exist but how can it be extended to f is integrable?