g(x), meanwhile, is both positive and lucky.
Strictly speaking, f(x) is non-negative :-)
At least in almost everything, as opposed to g(x), who always is.
f(x) isn't positive only when he says nothing!
At least g(x) is always rational.
Let's assume HIV(g(x))=f(x). In that case g(x) isn't really all that lucky.
He's always positive just like his friend h(x) = x^2! Except h(x) has a habit of imagining the negative.
So he's depressive. ^^
but if g(x) starts to imagine... nothing happens with him, but f(x)...that's another story...
g(x) is very lucky though.