Re: Provinf bounded variation

In article <4f2740F1gu3ohU1@xxxxxxxxxxxxxx>, Konrad Viltersten
<tmp1@xxxxxxxxxxxxxx> wrote:

I wish to prove that a function is of bounded variation.
The function i'll regard is f(x) = cos(kx) and i have the
following suggestion.

f in BV([a,b]) if it can be written as a sum of two
functions; one non-decreasing and one non-increasing.

[...]

Is it right to regard the problem this way?
Is there a more straightforward approach?

yes


(Only yes or no, please. It's sort of a homework.)
.

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