The Number Zero
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Zero is sometimes called nought (naught) or nothing or nil or O (pronounced oh).
Zero is a very strange number.
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It is neither positive or negative. If you add or subtract zero to any number, that number stays the same. If you multiply any number by zero, you get zero.
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Any number raised to the power of zero is one, so 2*=1 (2 to the power of 0). However, it gets even worse. You cannot divide a number by zero. You cannot take the zeroth root of a number
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Zero has two meanings. It can be a number in its own. "I have two apples, and give you two. I now have zero apples." This idea seems normal to us, but it confused the ancient Greeks, and medieval people. How can you say that nothing is a number?
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