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Zero (0) is a number signifying the absence of a thing we count. Among integers it precedes 1 and follows -1.

Some properties of and facts about this number follow:

Dividing by zero is not defined, it is a forbidden operation mainly because it breaks equations (allowing dividing by zero would also allow us to make basically any equation hold, even those that normally don't). In programming dividing by zero typically causes an error, crash of a program or an exception. In some programming languages floating point division by zero results in infinity or NaN. When operating with limits, we can handle divisions by zero in a special way (find out what value an expression approaches if we get infinitely close to dividing by 0).

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