There are people today that I've encountered in real life that don't accept even zero let alone the negative integers. Of course, as somebody that understands them, you think that that's stupid. They normally come up on some travesty of mathematical reasoning that depends upon taking a trivial statement out of context and then call it a proof.

Most of them are fairly smart outside of mathematics and formal logic. They must be to care.

I once saw a man, within the same hour no less, deny the "existence" of negative numbers and then point out that we could use peanut butter that we had at hand as a sealant for an impromptu bong.

That's pretty smart. Plus they're apparently even useful for practical things on occasion and that's always nice.

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