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This term is used when the result of a certain operation isn't defined. For example, you can't divide one by zero (or any other number by zero), because that would mean that zero times some number equals one; but this is never the case. Or, when calculating with real numbers, you can't take the square root of a negative number, because the square of either a positive or a negative number gives a positive number; no real number, when squared, gives a negative result.

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15y ago

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