As I understand that for differentiable and monotone functions we can partition the period and find the total variation, but what about the case when it's not differentiable ?

For example in this article http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=1083433 the authors have essentially mentioned the total variation of signum type function is 4 . But how is it done ? In general it looks to be 2.

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