this post was submitted on 26 May 2026
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In the history of mathematics, -1 was understood waaaay before 0.
For the Greeks, doing 1-1 would be invalid, something close to dividing by zero for us.
Fun fact, for the greeks, 1 is not a number either - they said the natural numbers started at 2 and unity is something else. This is because, they said, all numbers represent pluralities.
Dividing by zero is well understood and sometimes even well defined.
That's a stretch.