Not sure what you mean specifically or what happened on that show, but historically (like, a long time ago) numbers were far more practical in use, there was not really a branch of mathematics for studying numbers or theory related to it. At one point the “first” math could be considered geometry. Now obviously 0 is useful and important, but if you are one of most of the population a couple thousand years ago you probably don’t have any reason to think about what it would look like to trade 0 sheep for 0 coins.
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