riemann stieltjes integral

[mohammad2232]

hello
can you tell me how can i proof that:
1-if p* is a refinement of p , then U(p*,f,a)<U(p,f,a)
2-and if f1 and f2 are riemann stieltjes integral how can i proof:

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thanks

 

[Steven G]

hello
can you tell me how can i proof that:
1-if p* is a refinement of p , then U(p*,f,a)<U(p,f,a)
2-and if f1 and f2 are riemann stieltjes integral how can i proof:

thanks

This proof should not be that bad. What have you tried. Show us your attempt writing up the proof. You really just need to know the definition of refinement and U(p,f,a).

 

[mohammad2232]

thanks this is

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and this is my answer i don't know this is true or not!!

thanks