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Mathematics 18 Online
OpenStudy (anonymous):

For which operations is the set {–1, 0, 1} closed?

OpenStudy (anonymous):

@*shadow*

OpenStudy (anonymous):

@Lyrae

OpenStudy (anonymous):

@*shadow*

OpenStudy (lyrae):

If you use an operation (+, -, /, *) on two numbers in the set and the set is closed, the result is only allowed to be a number in the same set. Any clue which operations might do this?

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