As a shorthand in this note, I'll use a==b to mean is
x[i] == x[j] => Unknown NO!
f(i) == f(j) => Unknown NO!
sin(i) == sin(j) => Unknown NO!
sinh(i) == sinh(j) => True OK!!!!
It turns out that it has to do with the Increasing
property, even though of course that is completely
g(i) == g(j) => true OK
Strangely, Decreasing doesn't work:
h(i) == h(j) => Unknown ???
I guess that technically this is an enhancement request
(Unknown is always a valid way to give up), but....
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