Nonnegative always includes zero, unless the author had muddled thinking themselves. Since positive is >0 and negative is <0, their negations are nonpositive for <=0 and nonnegative for >=0.
I wasn't precise enough. The Wikipedia page talks actually about "positive" integers, and I transformed this in my head to what should be written there.
I wasn't precise enough. The Wikipedia page talks actually about "positive" integers, and I transformed this in my head to what should be written there.
Original quote:
> !x enumerate the positive integers less than x.