Derek Martin wrote:
Zero is a problem, no matter how you slice it.
I definitely agree with that. Depends on the the real problem that is
behind the OP:s question.
Zero can be considered
positive or negative (mathematically, 0 = -0).
I've read quite a few articles written by mathematicians and
mathematically oriented engineers, and my impression is that most of
them, and therefore me included, use those words with the following meaning:
Positive: >0
Negative: <0
When zero is to be included, the following terms are used:
Non-negative: >=0
Non-positive: <=0
Using this convention, zero is neither positive nor negative. Wikipedia
seems to agree with that:
http://en.wikipedia.org/wiki/Positive_number
/MiO
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