[Rivet] Poll: deltaEta -- signed or unsigned?

[Hendrik Hoeth]

Thus spake Ben Waugh (waugh at hep.ucl.ac.uk):

> I agree. I'm not even entirely sure I would expect a vector library to
> have these "delta" functions, but if it does I would expect unsigned
> values.

Well, they are not class members, but defined in the same header files
as our three- and four-vectors.

-- 
The minimum number of planes one should own is one. The correct number
is n+1, where n is the number of planes currently owned. This equation
may also be re-written as s-1, where s is the number of planes owned
that would result in separation from your partner.       -- Veluminati