Let f: r --> r prove that f is continuous on r iff f-1(h) is a closed set whenever h is a closed set

Answer with Step-by-step explanation:

We are given that a function is a continuous on R

f:RR

We have to prove that if function is continuous ton R iff inverse image of closed set H is closed.

Let H be a closed set and function is continuous  then R-H is a opens set

=Open set

When function is continuous then inverse image of open set is open

Hence, is a closed set

Conversely,

Let inverse image of closed set H is closed

If H is closed set then R-H is open set

When inverse image of closed set is closed then R-inverse image of H is opens set

When inverse image of open set is open then  the function is continuous.

Hence, function is continuous.

Hence proved.

(x,y) it'll always be like that.

in this case x is grams and y is ounces.

if there were numbers there, like (5,3)

x would be 5 and y would be 3.