Vsauce2 | Can You INVENT a Number? Yes. #shorts @Vsauce2 | Uploaded 2 years ago | Updated 2 hours ago
What do you do when you've got a mathematical expression that's unsolvable because the numbers you need don't exist? You do what Hero of Alexandria did: you just invent one. That's how we got the concept of imaginary numbers, which Rene Descartes derided as being totally useless. Turns out he was wrong.

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