Quote:
Originally Posted by ntvy95
Hi, I am stuck at the part (e). I have two questions:
1  Is R' a typo? If R' is R then:
2  Refer to (b), I observe that:
Refer to (c), I observe that:
But I think that happens only when t <= 1? Am I mistaken somewhere?

1. I assumed while performing a proof that ',' is just a comma char, not a typo
2. (c) works well for t>=0. Do not refer from (b) to (c). Try to refer to the previously proven inequality (so, from (c) to (b)).