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January 30, 2015

January 30, 2015

Posted by **Mike** on Monday, January 18, 2010 at 7:39pm.

- math -
**MathMate**, Monday, January 18, 2010 at 11:28pmIs the set closed under this operation?

5+5 = 10

(note that 5 ∈ℤ' and 10 ∉ℤ', where ℤ' is ℤ\10)

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